Lena Vasquez has spent three years putting dangerous men in prison. Nikolai Morozov is her most dangerous case yet, so the FBI sends her undercover to bring him down.She had a plan. He ruins it in seconds, hiring her on the spot and leaving a note on her desk: I know why you’re really here.Now she’s deep inside his world, working to uncover a conspiracy tied to her own agency, and slowly losing control of something she never expected, Him.