Midnight Unleashed by Lara Adrian

Banished from her Atlantean colony, disgraced immortal Tamisia longs for a chance to redeem herself and return home where she belongs. Her work at a Rome women’s shelter has given Sia purpose, but when a break-in results in a brutal killing, her quest for answers puts her in the middle of the hunt for a dangerous enemy of the Order–and brings her up against one of the deadliest of their Breed warrior members, the Gen One vampire, Trygg.

A former Hunter enslaved to the commands of a madman, Trygg has devoted his life to the Order. Duty is his only master now, until an interfering beauty inserts herself into his investigation. The last thing Trygg wants is a partner in his mission, but Sia will not be denied–nor will the fierce desire she stokes in him. Soon the warrior who needs no one is craving the only woman he should not desire, unleashing a powerful hunger in his cold heart, and in his blood.