Wren Hartley's three-year secret affair with Alpha Callum Ridley shatters when she learns he's been openly pursuing her stepsister Isabelle. Fresh from surgery and emotionally vulnerable, she accidentally enters the wrong hotel room and offers a marriage contract to a stranger. He accepts, not revealing that he's Elias Thorne, the Lycan crown prince who knows from her scent that she's his destined mate while maintaining his lazy playboy persona.