Black Key Covenant

The black keyhole burned itself onto her chest the second she tried to cuff him. Now the man she came to arrest is the only one who can stop her from cracking open like the rest of this godforsaken city. Mara Quinn was supposed to shut down Adrian Vale's underground shop and bury his illegal seal-craft for good. Instead, she's the one carrying the mark—a living anchor for the same curse he's been trapping in brass. Every job they run together drives the keyhole deeper. Every time he touches her to pull the curse back, the heat between them gets harder to ignore. He's broke, desperate, and hiding something that could gut her career. She's cold, controlled, and exactly the kind of authority he's spent years dodging. But the closer they get to the truth, the clearer it becomes: she's not collateral damage—she's the final key, and someone powerful wants her turned. If she lets him seal the mark, she loses the only lead to her family's buried scandal—but if she forces the lock open, the city might swallow them both.