LAPD detective Cassidy Ryan has been living with his Dom, Zachary Teak, for nearly two and a half of the best years of his life. Brought together when a brutal serial killer targeted gay members of Zack's online BDSM club, the couple think they've put the past behind them... that is until another victim turns up, murdered in the same horrible way as before. When Zack receives a threatening note from the killer, the man convicted of the crimes becomes the focus of the investigation. Cassidy and Zack are thrown right back into a hideous nightmare which seems to be getting worse as more bodies begin piling up. Just when Cassidy and his partner think they've narrowed down the identity of the killer, a surprising twist throws everything off kilter and Cassidy and Zack find the life they've built together unravelling. Zack is a dominant to the core and giving up control to his submissive who insists on protecting him, is a hard thing for the Dom to accept. Cassidy knows the score and protecting Zack is his top priority... even if that means ruffling his Dom's feathers. As the body count rises, so does the tension between the lovers when they turn to each other for comfort. When they find themselves in the monster's sights, the strength of their love will be tested as never before.