Saint by Charissa Gracyk

Kidnapping his enemy’s daughter? Easy. Resisting her sweetness while they’re snowed-in and there’s only one bed? Brutal.
Nik “Saint” Valentine goes by a lot of names and identities—former Bratva enforcer, FSS agent, prison inmate and now assassin. With endless black ink, too many scars to count and a sarcastic streak that should be registered as a lethal weapon, he takes “bad boy” to a whole new level.
When opportunity strikes, Saint impulsively kidnaps the daughter of the billionaire tycoon bankrolling The Agency, a secret organization trying to eliminate Saint’s team. He isn’t prepared, however, for the sweet, yet sassy good girl to challenge him at every turn.
Mia Carlisle might be Nik’s prisoner, but she’s always been fascinated by dangerous men. Her big, grumpy, tattooed captor with the faint, sexy accent who just handcuffed her to the bed is no exception. He’s beyond intriguing and takes her boring, lonely life from zero to overdrive in the blink of an eye
Together, Saint and Mia head to Russia to lay a trap to catch her father. But when Saint’s dark past finally catches up with him, and secrets are revealed, old ghosts and bloodthirsty vengeances threaten to extinguish Mia’s innocent light. Saint knows he’ll do anything to protect her…even if it means facing the monsters that could inevitably destroy him.