Shadow's Kiss - Monstrous Hearts, #4

Fleur Corrigan learned the supernatural was all too real on one terrible night, and even now, years later, it has marked her in ways she refuses to admit. But when she's betrayed and thrown back into a web of dark magic, brutal sacrifices, and creatures who see humans as mere prey, she not only has to face these new dangers but accept help from a figure of that world: Dario Vitale. He's infuriating, seductive, and her best chance of coming out of this unscathed...
if she can bring herself to trust a demon. Shadow's Kiss is a new adult paranormal erotic romance with a demon dom and a happily-ever-after ending. For fans of the other Monstrous Hearts books, this takes place five years after Wolf's Kin, and Alice and Colton return as secondary characters.