Fingerprint of Sin — book cover

Fingerprint of Sin

by J.D. Karslund

41K+ reads

The night Ada Monroe fled a blood-soaked room, she left behind her future—and the boy who once swore he’d keep her safe. Years later, she’s a ghost on the graveyard shift, guiding strangers’ routes while her own life stands still. Until Killian Voss walks in: heir to a fallen crime dynasty, long rumored dead, and holding a childhood photo she never knew he kept. Her ex-friend wants her silenced. A locked flash drive tied to her heartbeat is the only bargaining chip keeping her alive. Killian offers protection inside his fortress of glass and steel, where every door obeys him and every secret has a price. Trapped in his world of velvet threats and calculated tenderness, Ada must decide which is more dangerous—the enemies hunting her, or the man who once failed her and is hell-bent on never doing it again. To survive, they’ll have to confront the past that destroyed them… and the desire that could finish the job.

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Chapter 1

By 2:13 a.m., the city is a grayscale heartbeat on my monitors.

Red and white blurs smear through rain-slicked streets, tiny arrows inch along bus routes, and the control center hums like a tired animal—fluorescent, overcaffeinated, pretending to be awake. I can track half the city with a flick of my mouse. I can reroute drunk college kids and exhausted nurses around stalled trains with a few keystrokes.

I can’t do a damn thing about my own life.

“Monroe, you taking a break or marrying that chair?” Ken calls from the back, his voice thick with vending-machine sugar.

“Chair and I are in a committed relationship,” I say without looking up. “Don’t be jealous.”

He laughs, the sound bouncing off concrete and glass, and I tap in a manual override to push Route 7 around an accident icon that’s blinking orange. On screen, the bus’s little arrow shivers, thinks about it, then obeys.

If only bodies were as easy to reroute as buses.

A camera feed blooms larger when I double-click: street-level, three floors below, rain silvering the empty plaza. Night wind shoves trash into a muttering circle. The building’s glass doors flash with passing headlights.

For a second—just a second—I see a smear of darkness that’s too still to be shadow.

Then someone steps into the halo of the entrance lights.

Dark coat, darker suit. Rain on his shoulders like he’s been carved up out of the night itself. He pauses with his back to the camera, head tilted to scan the lobby through the glass.

The hair on my arms prickles.

Ken’s footsteps crunch past the row of old keyboards. “Want anything? I’m going on a snack run.”

“I’m good,” I say, because my throat is tight, because I’m suddenly not sure I remember how to swallow.

I zoom the camera. It glitches, struggles, focuses.

He turns his head just enough for me to see his jaw, the slash of his mouth, the ghost of a profile I’ve seen before—in news clippings, grainy photos shoved under doorways, in fever dreams that drag me back to the night everything went wrong.

No.

“Actually, Ken?” My voice sounds wrong—too thin, too far away. “Grab me a soda?”

“Type?”

“Anything.”

He makes a low whistle that says he heard the shake I tried to hide. “Back in five.”

The door clicks behind him. The room exhales.

Below, the man swipes something at the security turnstile. The camera angle doesn’t let me see his face fully, but I see enough: the precise, fluid economy of his movements; the way he walks like he owns not just the building but the ground under it; the faint smile that’s more calculation than warmth when the night guard glances up.

The guard nods. No hesitation, no questions.

He was flagged as cleared access. By who?

My fingers move on their own, pulling up the visitor log. For a moment, all I get is a spinning cursor.

Then a line appears:

03:12—VOSS, KILLIAN—TEMPORARY ACCESS GRANTED—LEVEL 19–21.

My heart doesn’t pound. It stops.

Killian Voss has been dead for six years.

Burned to nothing in a warehouse fire, according to the papers. Whispered back into existence in every rumor the underworld trades like currency. But the official story is clear: no body, assumed perished, case closed.

On my monitor, the elevator indicator ticks upward. 3. 4. 5. 6.

Level 19–21.

I look at the level indicator above my head. 20.

“No,” I whisper, useless as a prayer.

It’s been ten years since the abandoned warehouse, the blood on my hands, the taste of rust in my mouth as I ran. Ten years of keeping my head down, my name blurred, my story as boring as possible. Night shifts, cheap apartments, cash-under-the-table favors that never ask too many questions.

Tessa always said I was terrible at hiding. Her laugh used to curl around my ribs and squeeze. “You look guilty standing in the cereal aisle, Ada.”

Tessa is not here. Tessa is in the list of things I do not think about if I want to keep breathing evenly.

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Ada fled a blood-soaked room years ago. The boy who failed to save her is now a crime heir — and back. Read this dark second-chance romance free online.
J.D. Karslund writes dark contract romance with a gothic soul. Her men trade in vows signed in blood, alibis kept in silence, and the kind of bargains that bind two people closer than any wedding ever could — see “Bride of the Blood Contract” or “Blood on His Cufflinks.” Captor-saviour dynamics, dangerous secrets, and heroines who learn that the cage might just be the safest place in the world. Read with the lights low.
“Fingerprint of Sin” is a dark romance novel that also draws on elements of Enemies to Lovers, Mystery Romance, Revenge Romance, Protector Romance, and Real Love Romance. Readers will find favorite tropes like mafia hero, second chance romance, morally grey hero, obsession, and betrayal woven throughout the story.
You can read “Fingerprint of Sin” for free on the Great Novels app, available on iOS and Android, or on the web at app.great-novels.com. Great Novels is a serialized fiction reading app for women who love dark romance stories — with hundreds of full-length novels across romance, fantasy, and paranormal genres, plus thousands of new chapters added regularly so there’s always a fresh obsession waiting.