Collateral Hearts — book cover

Collateral Hearts

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Bodyguard Romance Protector Romance Enemies to Lovers Mystery Romance Dark Romance Real Love Romance

Riley Knox thought the worst was over the day she sold out her crew and disappeared into witness protection. Now she’s just another grease-stained mechanic with a fake name—until a photo of her surfaces on a criminal forum with a chilling message: “We know where you are.” To keep the state’s star witness alive long enough to testify, the government sends Cole Mercer, a high-risk operations officer who treats rules like armor and Riley like cargo. He’ll track her every move. If she slips once, he’s the one who turns the key on her cell. But as attacks close in and the system meant to protect Riley starts to look rigged against her, guardrails crumble. Under siege in safe houses and motel rooms, banter turns to trust and a forbidden pull neither can afford. When saving innocent lives means breaking the law—and breaking each other’s futures—Riley and Cole must decide what, and who, they are truly willing to protect.

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Chapter 1

By the time the sun slipped behind the strip mall across the street, my hands were black with grease and the sky over the shop looked like an oil spill—purple, orange, and one bad decision away from dark.

I was closing up, same as every night. Roll the bays shut. Kill the compressor. Pretend this life was permanent and not printed on dissolving paper.

The bell over the front door chimed.

“We’re closed,” I called without looking up from the invoice I was pretending to understand. “Come back tomorrow if your car still hates you then.”

The air shifted. Not footsteps—presence. Too still. Too deliberate.

“Riley Knox.”

My pen slipped. Nobody called me that here. My name in this life was Rae Nolan, printed on my W-2, stitched in cheap thread on my coveralls. Only two people still used the one I’d bled for, and both of them were on government letterhead.

I lifted my head.

He filled the doorway like he’d been carved for it—broad shoulders in a dark jacket, posture military-straight. Close-cropped brown hair, clean-shaven jaw, the kind of face people trusted until they noticed the eyes. His were cool and precise, a blue-gray that had measured a lot of rooms and probably a few corpses.

He held my real name in his mouth like it was evidence.

I swallowed. “Wrong girl.” I forced a smile, too bright. “Happens all the time. You want oil change, tire rotation, stolen identity—little of everything?”

His gaze traveled—sign, counter, me. It stuck on the grease on my forearms, the smudge on my cheek I’d missed, the faded ‘Quinn Auto’ logo over my chest. I watched him catalog me, felt it like fingers tracing a wanted poster.

Then he reached into his jacket. I tensed, every old instinct flaring awake, but he just pulled out a slim black wallet and flipped it open.

Federal badge. Photo. Name: COLE MERCER.

I laughed once, brittle. “Damn. I was really hoping you were a tax auditor.”

He didn’t smile. “You’ve been sloppy, Knox.”

“I told you, it’s Rae here.” My fingers tightened around the pen until the cheap plastic creaked. “And unless this is about my boss’s expired vending machine license, you’re supposed to call first.”

“We did.” His gaze stayed on me. “You didn’t answer.”

My old burner, the one I kept in the bottom drawer of my bedroom dresser, had been dead for months. I’d told myself that was a good thing. No calls. No orders. No reminders that my life was borrowed.

Something cold slithered under my ribs.

“Look,” I said, reaching for flippant because the alternative was panic. “If this is about overdue paperwork, have a heart. I’ve been busy actually working for a living.”

He set his phone on the counter and turned it so I could see the screen.

A grainy photo took up the display—me, yesterday, standing by bay three, head tipped back as I wiped sweat and grease off my face with my forearm. My eyes were closed. I looked tired and almost happy.

Underneath, in blocky text, four words: WE KNOW WHERE YOU ARE.

Every ounce of heat drained out of my body. The walls of the office narrowed to the rectangle of the screen.

My voice scraped. “Where did you get that.”

“Encrypted forum,” he said. “Channel that used to belong to your old associates. It lit up ten hours ago. Image’s already been copied to half a dozen other places.”

There was a roaring in my ears, a flood of memory—dim motel rooms, coded calls, the way my crew used to pass messages under the radar. We know where you are. Once, that had meant safety. Now it was a knife.

I forced myself to breathe. In. Out. Air tasted like burnt coffee and solvent.

“So,” I said, my voice steadier than I felt. “You drove all the way out here to show me my new fan club?”

He studied me, unreadable. “I’m here because your cover is blown. The state considers you a high-risk asset in active danger.”

I snorted. “That’s adorable. The state remembering I exist.”

His jaw tightened, the first crack in that stone face. “Pack a bag, Knox. You’re leaving. Now.”

“No.” The word jumped out before I could cage it.

His brows edged up just a fraction. “You don’t have a choice.”

“That’s funny, because that sounds exactly like something people say right before they screw me over.” I stepped back from the counter, away from the phone and the photo and those four sharp words. The fluorescent light buzzed overhead, too bright. “I have a job. I have rent. I have—” I bit it off.

Friends. A rhythm. A life that almost felt like it belonged to me.

“You have a plea deal,” he corrected. “Which keeps you breathing as long as you cooperate and don’t offend again. There are new proceedings tied to your testimony. New targets on your back. You leave with me, you stand a chance.”

“And if I don’t?”

“Then people start dying.” He said it like a weather report. No dramatics, just probability.

A car door slammed outside, making both of us flick our attention toward the front windows. The shop bay glass was smeared with years of dust and fingerprints, giving the world outside a blurred, underwater look.

Mara’s voice cut across the lot, loud and pissed at someone on the phone. “I don’t care what he said, Lenny, if you don’t pay by Friday I’m selling your junker for scrap. I got a business to run, not a charity—”

Her silhouette moved past the window—a compact woman with a messy bun and a walk that said anyone who wanted trouble could come get some.

Cole’s gaze tracked her, then flicked back to me. “She know who you are?”

“She knows I fix cars,” I said. “And that I don’t call in sick unless I’m dying. That’s enough.”

“Not anymore.”

The bell chimed again and Mara Quinn pushed in backward, shoulder braced against the door as she wrestled a box of parts bigger than her torso. She stopped when she saw Cole, eyes narrowing.

“If you’re selling anything, the answer’s no,” she said. “We already got a credit card processor, and Rae’s not interested in Jesus.”

Rae. The cheap name that had started to feel less cheap when she said it.

Cole slid his badge across the counter toward her without turning away from me. “Cole Mercer. Federal Operations.”

Mara put the box down with a thud. “You gotta be kidding me.”

She didn’t touch the badge. Her gaze snapped to mine, hard and searching. “You in trouble?”

I opened my mouth. Nothing came out.

Cole answered for me. “There’s been a credible threat against Ms. Nolan. I’m here to relocate her to a secure site.”

Mara barked a short, humorless laugh. “Relocate? Like she’s a vending machine?” She stepped around the counter, planting herself half a step in front of me without even seeming to think about it. I felt the shield of her back like another wall. “You can’t just walk in here and drag my mechanic off like she’s a crate of parts.”

“I can,” he said calmly. “Her safety falls under federal jurisdiction. Staying puts her and everyone around her at risk.” His gaze dipped to Mara’s forearms, bare and streaked with her own grease, then back to me. “You’re both already in view.”

Mara’s shoulders squared. “Maybe if the feds hadn’t forgotten about her for, I don’t know, years—”

“Mara,” I cut in, because this was about to go sideways fast and I needed something I could control. “It’s fine.”

“The hell it is.” She turned, anger cracking into something more wounded when she saw my face. “Rae…”

I could lie. I’d done it so many times it should’ve felt like breathing. Tell her it was a misunderstanding, some bureaucratic screwup. Tell her I’d come back in a few days.

But the photo on that phone was real. And so was the way my heart had sprinted when I heard my old name.

“I have…history,” I said, the word sharp on my tongue. “This is about that, not about here. You didn’t do anything wrong.”

Her eyes searched mine. “History like…tickets for street racing, or history like…” She gestured vaguely, encompassing his badge, his posture, all the ways he didn’t fit here.

“History like federal witness,” Cole said, every syllable weighed. “She can’t stay where she is.”

Mara swore under her breath. “You told me you’d never even been in a courtroom.”

“I said I’d never been convicted,” I said softly.

Her face shuttered for a second. It hurt, seeing that. Then she inhaled, like she was swallowing the reaction whole. “You come back to me alive, you hear?” She pointed a warning finger at Cole without looking away from me. “If anything happens to her—”

“My job is to prevent that,” he said.

I almost laughed. His job had once been to disappear me. To file me away as collateral.

“I’ll pack a bag,” I said, before Mara could start a war. “Give me ten minutes.”

Cole nodded once. “Five. And whatever you bring gets searched.”

“Of course it does,” I muttered.

I brushed past him, the heat of his body a solid line in the narrow gap between counter and wall. He smelled like clean soap and something metallic underneath, a faint echo of gun oil or old blood. The contact was fleeting, my arm grazing his chest, but it lit a static spark under my skin.

His hand didn’t move. Didn’t reach, didn’t flinch. But I felt the awareness in the way his breath changed—just a fraction, enough that I noticed because I was looking for any weakness in this wall they’d sent.

Up the narrow stairs at the back, the office hum gave way to the softer creaks and sighs of the second-floor apartment Mara rented me cheap. My boots ticked against the worn wood. I shut the door and leaned against it for a second, palms flat.

They found me.

Of course they did. The universe had been too quiet. Three years of gray anonymity, and I’d almost convinced myself I’d outrun cause and effect.

I moved fast, muscle memory taking over. Backpack from the closet. Jeans, T-shirts, the one hoodie that still felt like a hug. Toothbrush from the chipped mug by the sink. The hard drive I kept taped under the desk, my one insurance policy I’d sworn I’d never use again.

I hesitated with that in my hand, cool metal against my palm. Bringing it was a bad idea. Bringing it was the only idea.

I shoved it in the bag.

When I came back down, Mara was at the counter, arms folded, eyes like flint. Cole stood where I’d left him, statue-still, phone back in his hand. He looked up when he heard me, gaze dropping to the backpack slung over my shoulder.

“Put it on the counter,” he said.

“Buy me dinner first,” I shot back, because this felt too much like being processed again, stripped down to whatever the state thought it owned.

One corner of his mouth almost, almost twitched. Then he caught it, killed it, and the mask slid back into place. “Bag. Counter.”

I dropped it with a heavy thud.

He unzipped it methodically, hands efficient, not rough. Clothes, toothbrush, the chipped mug I’d thrown in at the last second. His fingers brushed the hard drive; his eyes flicked to mine.

“What’s this?”

“Old music,” I said.

His silence said he didn’t believe me. But he didn’t pull it out, just zipped the bag closed again.

“You understand,” he said quietly, “if I find you’ve violated the terms of your deal, my orders are explicit.”

“Yeah, I think I saw the fine print.” My throat felt tight. “If I sneeze wrong, you get to slam the door on the rest of my life.”

“I’m not interested in your sneezes,” he said. “I’m interested in you staying alive long enough to sit in a chair and tell the truth. Again.”

Mara made a rough sound that might have been a scoff. “That’s all she is to you? An ‘asset in a chair’?”

His gaze shifted to her, steady. “Right now, she’s my responsibility. That includes anyone within blast radius if someone decides to make an example.”

Blast radius. The phrase slid under my skin and hooked there.

“Do I get a say in any of this?” I asked.

He looked back at me, and for the first time, I saw something flicker behind the control. Not pity. Something tighter. Haunted.

“You had your say when you signed the deal,” he said. “This is the fallout.”

Sometimes honesty hurts worse than a headline.

I hitched the backpack onto my shoulder again when he handed it back. His fingers brushed mine in the transfer, a brief contact that shouldn’t have meant anything. It did. A tiny shock, my nerves flaring like they remembered other nights, other hands. Not his, never his, but my body didn’t know the difference between danger and intensity.

“Car’s out back,” he said. “We go straight there. No detours, no goodbyes to anyone else.” His eyes flicked to Mara. “You don’t talk about this. Not to friends, not to customers. Not online.”

Mara’s lip curled. “You feds made that mistake, not me.” She stepped closer to me and gripped my shoulder hard enough to bruise. “Text me when you can. Or have Mr. Federal Operations here send smoke signals.”

“I’ll try,” I said, knowing it was probably a lie.

Cole opened the door, scanning the lot with a quick, trained sweep. His hand hovered near his jacket, where I had no doubt a gun sat, quiet and ready. The twilight outside had deepened, the first stars bleeding through the smog.

I hesitated on the threshold, looking back at the cramped office, the crooked ‘We Fix What They Broke’ sign Mara had painted herself. The smell of rubber and oil and burnt coffee that had become home.

“You hesitating is how people die,” Cole said softly, only for me.

I turned my head. He was closer than I’d realized, his breath warming the small space between us. Up close, I could see the tiny white line of a scar along his jaw, the faint shadow under his eyes like sleep was a stranger.

“Is that your motivational poster?” I asked. “Slap that on a kitten, see how it sells.”

His gaze held mine, steady. “You can hate me later. Right now, you move.”

Something in his tone—calm, implacable—slipped under my defenses in a way yelling never would have. For all the control, there was a thread of urgency there, a memory of loss maybe, even if I couldn’t see it.

I stepped through the door.

The air felt colder outside, thick with exhaust and night. A dark SUV idled by the side alley, engine low and smooth. Tinted windows, government plates. Of course.

Cole walked half a step ahead of me, eyes everywhere, shoulders coiled. His hand brushed my elbow once, just enough to guide, not enough to claim. It shouldn’t have steadied me. It did.

“Front seat,” he said. “I need you where I can see you.”

“Romantic,” I muttered.

He opened the passenger door. For a heartbeat, we were close again, his body a solid line blocking the rest of the world. His gaze dipped to my face, lingering for a fraction of a second on the grease smudge I hadn’t wiped off.

“You missed a spot,” he said.

“Story of my life.”

I climbed in.

As the door shut with a heavy thunk and the outside sounds dulled, a single thought lodged hard in my chest:

I was back in the system.

Only this time, the man holding the keys was sitting inches away, his profile cut sharp against the dying light as we pulled out of the lot and my old life shrank in the side mirror.

I didn’t know yet whether Cole Mercer was going to be my salvation or the last mistake I ever made.

But as the SUV merged onto the highway and the city swallowed us, I knew one thing for sure.

Whatever came next, there was no going back.

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