Merciless Heir by Monica Kayne

He came for the blood of his enemy but took me instead.
Andrei Kozlov—ruthless head of the notorious Kozlov crime family. A tattooed and seductive monster. As dangerous as he is beautiful.
When he catches me attempting to escape his rival’s clutches, I pray he’ll be my savior—but Andrei is no one’s savior.
Held captive at his palatial estate, I’m his pawn. He trains me as a spy, tasked with uncovering his family’s ugly secrets.
All I want is my freedom, but the more I fight him, the harder he pushes me. With each day that passes, a new woman emerges. Someone stronger than I ever thought possible.
I should despise him, but his touch sparks a hunger inside me. And in the dark of night, his body on mine is the only thing I crave.