RUTHLESS VOWS

Chapter One – A Job with the Devil

Sienna Carter had one goal-revenge.

The towering Blackwood Enterprises building loomed over Manhattan like a throne carved from glass and steel. It was sleek, modern, and powerful-just like the man who owned it.

Adrian Blackwood.

The name alone sent a bitter chill down Sienna's spine. He was the reason her father had lost everything, the reason their family had crumbled. And now, after years of careful planning, she was stepping right into his lair, playing the perfect role of an ambitious young professional eager to prove herself.

The massive revolving doors spun slowly as she stepped inside. The air-conditioned lobby was cold, sterile, and filled with the scent of polished wood, fresh coffee, and expensive cologne. It was a world so different from the one she had grown up in-a world of wealth, power, and ruthless ambition.

She adjusted the strap of her black leather bag, keeping her grip firm to stop her hands from shaking.

This wasn't fear. No, she refused to call it that.

It was adrenaline-the kind that coursed through a person's veins before a high-stakes game. Because that's what this was. A game.

And she intended to win.


---

The Woman with a Plan

Sienna Carter was twenty-six years old, standing at 5'7" with a slender yet toned frame-just enough to look graceful but strong. Her dark auburn hair cascaded in loose waves past her shoulders, framing a face that was both delicate and fierce. High cheekbones, full lips, and a sharp, slightly upturned nose gave her an air of elegance, but it was her hazel eyes-a striking mix of green and gold-that truly set her apart.

Those eyes had once been filled with warmth and innocence. Now, they held nothing but determination and fire.

She had been raised in privilege, once a girl who never had to worry about finances, until Adrian Blackwood had ruined her father. She had watched her family fall from grace, her mother grow sick with stress, her father sink into despair and disgrace.

She had vowed, even as a teenager, that one day she would make Adrian pay.

And today was that day.


---

The King's Throne

The private elevator ride to the top floor was silent, but her heart wasn't. It pounded with each floor she ascended, echoing in her ears like war drums.

As the doors slid open, she stepped into a world that screamed power.

The office was an empire of dark wood, steel, and glass. Floor-to-ceiling windows stretched across the back wall, offering a breathtaking view of the New York skyline. Shelves lined with expensive books and whiskey bottles stood like silent witnesses to the deals made in this room.

But none of that compared to the man standing by the window.

Adrian Blackwood.

At thirty-two, Adrian exuded an undeniable aura of control. He stood at an intimidating 6'3", broad-shouldered with a powerful, lean frame built like a man who knew how to dominate a room. His dark hair was thick and perfectly styled, short at the sides with just enough length on top for a hint of rebellion.

But it was his eyes that captivated and unsettled.

A deep, piercing stormy gray, they were the kind of eyes that saw everything-that could strip a person down to their very soul. Sharp, calculating, always assessing.

His jawline was strong and chiseled, with just the barest hint of stubble. His lips were firm, rarely ever curving into anything that resembled warmth.

He was dressed in a charcoal-gray suit, tailored to perfection. His jacket rested on the back of a leather chair, his white dress shirt unbuttoned at the collar, revealing a sliver of tanned skin. His sleeves were rolled up, exposing powerful forearms-an image of effortless dominance.

He didn't turn immediately. He stood there, gazing out at his kingdom like an emperor surveying his empire.

Sienna swallowed, her breath catching for half a second before she forced herself back into control.

Then, he turned.

Their eyes met.

And for a brief, dangerous moment, the world seemed to still.

His gaze was sharp, dark, and unreadable.

"Sienna Carter," he murmured, as if tasting her name on his tongue. "You're early."

She forced a polite smile. "I believe in making a strong first impression."

One dark brow arched. "Do you now?"

He studied her, taking his time, as if dissecting her layer by layer.

She met his gaze, unwavering. She refused to be the first to break.

Adrian gestured toward the black leather chair across from his desk. "Sit."

She obeyed, smoothing out the fabric of her fitted navy-blue dress as she crossed her legs. Her heels clicked against the floor-sharp, deliberate, a reminder that she belonged in this space.

Adrian leaned back in his chair, fingers steepled together. "Your résumé is impressive."

She waited. There was always a but.

"But..." His lips curved, just slightly. "I don't hire assistants based on qualifications alone."

She tilted her head slightly. "Then what do you base it on?"

His smile didn't reach his eyes. "Loyalty. Discretion. The ability to keep up."

Keep up?

Sienna's stomach tightened. This wasn't a normal interview. He was testing her, studying her every reaction.

"I can handle whatever this job requires," she said smoothly.

Adrian's gaze flickered-just for a second. A brief, unreadable glint of something.

"We'll see about that."

Without another word, he picked up his phone and pressed a button.

"Lena, cancel my three o'clock. I have a new assistant to evaluate."

A rush of cold washed over Sienna's skin.

This wasn't an interview anymore.

It was initiation.


---

The Test Begins

Adrian leaned back, his fingers drumming against the desk. "Tell me, Miss Carter, do you handle pressure well?"

She held his gaze. "I thrive under pressure."

"Good." He tapped his watch. "You have fifteen minutes to schedule a private jet to Chicago, organize a dinner reservation at Monroe's for six, and reschedule my morning meetings without clashing with existing appointments."

Her pulse kicked up.

But she didn't hesitate.

She reached for the tablet on the desk, quickly pulling up Blackwood Enterprises' internal scheduling system. Her fingers flew across the screen as she located Adrian's itinerary, noting the small gaps between his obligations.

Within seconds, she was dialing the private jet service, speaking with crisp efficiency.

"Blackwood Enterprises requires a Gulfstream G650 to be ready for departure at four-thirty this afternoon to O'Hare. No delays. Ensure a priority landing slot."

She didn't ask-she commanded.

The operator on the other end stammered a quick "Yes, Miss Carter."

One down.

She moved onto the next task, dialing Monroe's-a Michelin-starred restaurant notorious for being booked months in advance.

"This is Sienna Carter, calling on behalf of Adrian Blackwood. I need a private dining room for six at precisely six o'clock tonight."

"I'm sorry, ma'am, but we're-"

Sienna didn't let the manager finish.

"Perhaps I should clarify," she said smoothly. "This isn't a request. It's an expectation. I'd hate for Mr. Blackwood to take his business elsewhere."

Silence. Then, a rushed, "Of course, Miss Carter. We'll make arrangements."

Done.

Her final task-rescheduling his morning meetings. She analyzed his schedule, shifting each appointment with surgical precision, ensuring no overlaps or wasted time.

By the time she set the tablet down, only seven minutes had passed.

Adrian had been watching her the entire time.

Now, he smiled-a slow, calculating curve of his lips.

"Interesting."

Sienna exhaled quietly, masking her triumph.

This was only the beginning.

And she had just won the first round.

Chapter Two – A Dangerous Game

A Job She Couldn't Afford to Lose

Sienna Carter had passed Adrian Blackwood's first test.

But she knew better than to celebrate.

Winning one round against a man like him didn't mean victory-it meant she was in the game now, and the stakes had just gotten higher.

She kept her face calm and unreadable as Adrian leaned back in his chair, fingers drumming lightly against his polished mahogany desk. His storm-gray eyes hadn't left her since she completed his impossible task with seven minutes to spare.

A slow, almost amused smirk curved his lips.

"Efficient," he murmured. "Very efficient."

Sienna folded her hands in her lap, forcing herself to relax under his piercing gaze. "It's my job to be."

He arched a brow. "You haven't even officially started yet."

She met his stare head-on. "Then consider that a preview of what I can do."

Something flickered in his gaze-interest, curiosity, or perhaps a test within a test.

She had no illusions about this job. Working as Adrian Blackwood's executive assistant was a front-an opportunity for her to get closer, gain access to his world, and slowly, methodically dismantle him from the inside.

Her revenge was a long game, and she was willing to play every move perfectly.

"Very well," he said after a pause. "You're hired."

Just like that.

No contracts. No formalities. Just a single decree from a king in his castle.

Adrian rose to his feet, towering over her at 6'3", all effortless dominance and quiet control. His charcoal-gray suit framed his broad shoulders with precision, the crisp white shirt beneath unbuttoned just enough to show the tan skin of his throat.

"Your first official day starts now," he said, adjusting his cufflinks. "Follow me."

Sienna pushed to her feet, keeping her chin high. She refused to be intimidated.

But the moment she walked out of his office and into the high-pressure world of Blackwood Enterprises, she realized something-

She was stepping into the lion's den.

And Adrian Blackwood was watching her every move.


---

The Shark Tank

The executive floor of Blackwood Enterprises was a battlefield.

Phones rang. Assistants in crisp suits clicked across the sleek marble floors, juggling schedules, calls, and last-minute emergencies. Conversations were low but urgent, and the tension in the air was thick with competition and controlled chaos.

Sienna had worked in high-pressure environments before, but nothing like this.

Here, one mistake could end a career.

Here, survival meant being faster, sharper, and more ruthless than the person next to you.

Adrian strode down the hall with his usual commanding presence, and the moment he passed, people straightened their backs. His employees didn't just respect him-they feared him.

And yet, the moment his gaze flicked toward Sienna, there was something else in those storm-gray eyes.

A challenge.

As if daring her to keep up.

She would.

She had to.


---

Her First Order

"Lena, brief Miss Carter," Adrian said without looking back.

A slim blonde woman-Lena, his senior assistant-turned to Sienna with a cool, unreadable expression.

Lena was in her mid-thirties, tall and poised with icy blue eyes and an air of efficiency so sharp it could cut glass.

She handed Sienna a tablet, her voice clipped and precise. "Mr. Blackwood's schedule for the next three weeks. Memorize it."

Sienna blinked. "All of it?"

Lena's thin lips curved slightly-almost amused. "Yes. Every meeting, every flight, every call. He expects you to anticipate his needs before he even asks."

She glanced at Adrian, who was already striding toward the boardroom.

"And a word of advice," Lena added in a lower tone. "Don't make mistakes. He doesn't tolerate them."

Sienna nodded, gripping the tablet tightly.

No mistakes. No weakness.

She could do this.

She had to.


---

The First Meeting

The Blackwood Enterprises boardroom was a testament to power.

A long black marble table, floor-to-ceiling windows, and a skyline view that reminded everyone sitting there exactly who they were working for.

When Sienna stepped inside behind Adrian, the room fell silent.

There were twelve men in suits, each one powerful, influential, and twice her age.

But none of them commanded attention like Adrian Blackwood.

He took his seat at the head of the table, his presence alone enough to demand respect and silence.

Sienna moved to stand behind him, her tablet in hand, ready to take notes.

She wasn't expecting the first blow to come so soon.

"Who is this?" one of the board members, a gray-haired man, asked, eyeing Sienna with mild disdain.

Adrian didn't even glance at him.

"My new assistant."

The man's brows furrowed. "What happened to-"

"She's irrelevant. Move on."

Sienna bit the inside of her cheek to keep her expression neutral. Adrian didn't waste time on useless questions.

"Miss Carter," he continued, without looking at her. "Summarize the key points from last quarter's report."

Sienna's stomach tightened.

She hadn't been given that report.

Lena hadn't mentioned it.

And yet, Adrian expected her to know it.

It was a test.

A brutal, unfair test.

She had two choices-admit she didn't have the data and look incompetent, or think fast and take a calculated risk.

She chose the latter.

Sienna inhaled sharply, then started speaking.

"The company saw a 6.8% increase in revenue, primarily driven by acquisitions in the tech sector," she said smoothly. "However, supply chain issues caused minor disruptions, leading to a 2.3% delay in deliveries, particularly in international markets."

Adrian finally looked at her. His gaze was unreadable.

Sienna pushed forward.

"Our primary competitors-Lancaster Holdings and Everstone Inc.-have seen a 3% decline in market share, which presents an opportunity for Blackwood Enterprises to expand further in emerging markets."

Silence.

Then-

One of the board members cleared his throat, nodding slightly. "That is... correct."

Sienna didn't let herself breathe in relief.

Because she wasn't the only one who had noticed what just happened.

Adrian's lips curved slightly.

Not quite a smile-something more dangerous.

She had guessed correctly.

And now, she had his full attention.


---

A Warning

After the meeting, as the board members filed out, Adrian remained seated, watching her with that same unreadable expression.

Sienna waited, standing tall.

Then, in a voice that was both calm and cutting, he said, "Don't ever try to bluff me again."

Her breath hitched, but she didn't flinch.

"I wasn't bluffing," she lied smoothly.

His lips twitched. "Liar."

She opened her mouth, but before she could speak, he stood, moving dangerously close.

Adrian Blackwood wasn't just intimidating-he was overpowering.

His storm-gray eyes locked onto hers.

"You're sharp," he murmured, his voice low. "I like that. But if you make one mistake..."

His fingers brushed her chin, just briefly, just enough to make her blood burn.

"...you won't get a second chance."

Sienna's pulse raced.

She wasn't just working for a billionaire.

She was working for a predator.

And in this game, the smallest misstep could mean her ruin.

Chapter Three – Playing with Fire


A Dangerous Proposition

Sienna Carter had known this job wouldn't be easy.

She had expected long hours, impossible demands, and a boss who thrived on pressure.

But she hadn't expected Adrian Blackwood to be watching her this closely.

It had only been a day since she started working at Blackwood Enterprises, yet she could feel his eyes on her constantly-measuring, testing, waiting for her to slip.

And she couldn't afford to.

Because Adrian Blackwood wasn't just a billionaire-he was a man who destroyed people without blinking.

And if he ever suspected her real motives, he'd ruin her before she had the chance to do the same to him.

Sienna straightened her spine as she walked into his office, her heels clicking against the sleek black marble floors. The space was massive, all dark tones and sharp edges, reflecting the man who owned it.

Adrian stood by the floor-to-ceiling window, his back to her, his posture composed yet commanding.

The late afternoon sun cast a golden glow on his perfectly tailored charcoal suit, highlighting the broadness of his shoulders, the lean strength in his frame.

His presence was magnetic, whether he was looking at her or not.

Which was infuriating.

She had spent years preparing for this moment. Years plotting revenge against this man.

She couldn't let herself get distracted.

Adrian finally turned, his storm-gray eyes locking onto hers with that same piercing intensity.

"You handled yourself well in the meeting," he said, his voice smooth yet edged with something unreadable.

Sienna kept her expression neutral. "I did my job."

His lips twitched slightly.

"Did you?" He stepped closer, slow and deliberate. "Because I don't recall giving you the quarterly report to study."

Sienna's heart kicked against her ribs, but she didn't let it show.

"I make it a point to stay informed," she said smoothly. "I did my research before coming here."

Adrian's gaze flicked over her, as if assessing every inch of her words.

Then, he smirked.

"Liar."

Sienna's fingers tightened around the tablet she was holding.

She had expected him to test her limits, but this felt like something else entirely.

Like a game.

And she wasn't sure if she was the hunter or the prey.

Adrian turned away, walking toward his desk. "There's a gala tonight."

The sudden shift in topic caught her off guard.

"A gala?"

He glanced at her. "The Blackwood Foundation hosts an annual charity event. It's one of the most important nights for the company. You'll attend as my assistant."

Sienna had done her research-she knew about the gala.

What she hadn't expected was to be pulled into it on her first day.

Adrian's gaze lingered on her.

"Wear something appropriate."

She held back the urge to roll her eyes. "Of course, Mr. Blackwood."

His smirk deepened.

"You'll be shadowing me the entire night. Don't disappoint me, Miss Carter."

Sienna turned on her heel and walked out of his office, her pulse racing.

She had entered his world.

And now, she had to make sure she didn't get burned.

A Dress for War

Sienna stood in front of the full-length mirror, adjusting the sleek, black evening gown that clung to her figure like a second skin.

The dress was a weapon-strategically chosen to make an impression without being obvious.

A fitted bodice, a slit high enough to be bold, but not inappropriate.

Her long, dark hair was styled in loose waves, her makeup enhancing her striking green eyes-the same eyes she had inherited from her mother.

The same mother Adrian Blackwood's company had destroyed.

Sienna's fingers curled into fists at the memory, but she forced herself to breathe.

Tonight wasn't about emotions.

It was about strategy.

She grabbed her clutch and left her apartment, ready to face the enemy.

The Blackwood Gala

The event was held at one of the most exclusive venues in the city, a sprawling ballroom bathed in warm golden light, filled with the most powerful and influential people in the business world.

Sienna stepped out of the car, smoothing her dress as she took in the scene.

Adrian was waiting by the entrance, dressed in a sharp black tuxedo that made him look even more untouchable.

The moment his gaze landed on her, something shifted in his expression.

Surprise.

Then, amusement.

Then, something darker.

She refused to let her breath hitch under his scrutiny.

Instead, she walked up to him with measured confidence.

"Shall we?" she said smoothly.

Adrian offered his arm-a formality, nothing more.

Sienna hesitated for only a second before slipping her hand around his.

His grip was warm and strong, sending an unwelcome jolt through her veins.

She ignored it.

This was all part of the act.

Inside, the event was a blur of expensive champagne, whispered conversations, and masked intentions.

Adrian moved through the crowd with effortless dominance, greeting people with polished charm, yet keeping his true thoughts hidden beneath a layer of cool control.

Sienna played her role perfectly-poised, efficient, the perfect assistant.

But then, everything changed.

A Ghost from the Past

She saw him across the room.

A man she never thought she'd see again.

Nathaniel Lancaster.

Her father's former business partner.

The man who had betrayed her family.

Her breath caught, but she forced herself to stay calm.

Nathaniel was speaking to Adrian, his expression unreadable.

Adrian's gaze flicked toward her, something sharp in his eyes.

Then, he gestured for her to come over.

Sienna's heart pounded as she approached.

"This is my new assistant, Sienna Carter," Adrian introduced.

Nathaniel's gaze snapped to her, recognition flashing across his features.

Sienna saw it-the slight widening of his eyes, the tightening of his jaw.

He remembered her.

But he didn't say anything.

Neither did she.

Adrian's gaze flickered between them, assessing.

But before he could speak, Nathaniel extended a hand.

"A pleasure, Miss Carter," he said smoothly.

Sienna forced a polite smile and took his hand, even as her skin crawled.

"The pleasure is mine."

Adrian watched them closely, his expression unreadable.

He knew something was off.

And Sienna had the sinking feeling that, from this moment on, Adrian Blackwood wasn't just watching her.

He was hunting the truth.