Russian Lullaby by Holly Bargo

A case of mistaken identify lands graduate student Giancarla Bonetti in a heap of trouble, only to be rescued by Bratva interrogator Vitaly Synvolka. Sensing that she’s his final opportunity to save what’s left of his humanity after a lifetime of brutality, he offers the innocent young woman three options: go back to her life and be killed by the thugs who kidnapped her; go far, far away and start a new life at a new school and hope the thugs don’t find her; or, marry him, accept his protection, and finish her degree.

Option #3 isn’t as easy as it sounds.