Painter and housewife Samantha "Sam" Darby has a decent life with her husband, Keith - safe, familiar, but increasingly unsatisfying, especially behind closed doors. Desire has faded into routine, and longing simmers unspoken beneath the surface. Then Sam meets Ty Boxx: alluring, enigmatic, and dangerously intoxicating. What begins as a spark of fantasy soon ignites into a fevered affair, awakening hungers and pushing Sam toward impossible new extremes of pleasure. But Ty's passion carries a darker current. As Sam's cravings intensify, and her body begins to change in unsettling ways, she realizes Ty has not been entirely honest with her. Worse, he may be more dangerous than she ever suspected. Torn between the man who loves her and the lover who has reshaped her, Sam must choose. And whichever path she takes, the consequences will be permanent ... and far more terrifying than desire alone can explain.