Call Sign: King by Livia Grant

He got cocky. Let his guard down.
Now the love of his life is paying the price.
For a moment he’d forgotten there were men who wanted him dead. Men who lived their lives in the dark, who could reach out of the shadows he used to live in, and he’d been naive to think the light inside her would keep her safe.
She was too bright to hide away though, made for the spotlight, and he’d felt warmer just by being near her… then everything went cold so fast.
In a breath she was gone, in the hands of his enemies, and he’d seen first hand what happened to women who crossed paths with the Volkov Bratva. They’d touch her, hurt her. She’d be afraid, suffering.
All because of him. All in the name of vengeance.
But that was their mistake, because in the maddening darkness her absence has put him in, a beast was sleeping… and they woke him up. Now everyone will pay.