In a world where werewolf packs are bound by ancient laws, Reina Voss is a rarity-a female alpha destined to rule. Her power is undeniable, her instincts unyielding, but the weight of leadership is a lonely burden. When her pack's survival is threatened by a mysterious plague spreading through the wolves, Reina must turn to an unlikely ally: Kade Mercer, a human doctor with secrets as dark as the forests surrounding their territory.

Kade never believed in the supernatural, but when he's thrust into Reina's world, he discovers a terrifying truth-his blood holds the key to the cure, but it comes at a price. As the line between predator and prey blurs, Kade becomes more than just a healer. He is the Host-a vessel for powers he doesn't understand, and a target for forces that would see both human and werewolf destroyed.