"I need someone to pretend to be my girlfriend," the Alpha heir Caleb Blackwood says, amber eyes gleaming. "Your family's bookstore survives, and I get what I need." Eve Mitchell accepts, unaware she's the last Gray werewolf—a bloodline with abilities to unite divided packs. As her dormant powers awaken, their fake relationship transforms into a true mate bond, threatening centuries of werewolf tradition. "Your mother died for these same abilities," Caleb reveals, protective yet fearful of what she's becoming. Meanwhile, Caleb's uncle conspires with hunters: "The Gray line must end before she changes everything." Eve must embrace her heritage or flee it. But can you outrun what flows in your blood?