Regan Malloy is a dedicated homicide detective married to her job. A tough woman who holds her own when it comes to the opposite sex, she is nevertheless resigned to lonely nights with fantasy men. When a serial killer targets wealthy submissive men from an upscale BDSM club, Regan is convinced the killer is a woman and goes undercover.

Kyle Ramsey is a topnotch litigator juggling life as a divorced father and a workaholic. Raised to be strong and to always take charge, he has trouble trusting that anyone else can get the job done. When he finds his good friend murdered, he mounts his own investigation despite Regan's warning not to interfere.

Regan is furious to find the sexy lawyer at the club but can't deny her attraction or her need to dominate him. Kyle discovers more than clues as, to keep from blowing their cover, the fiery cop demands obedience. Together they embark on a journey to explore this new world of hidden desires, but the road could take a dangerous turn when they cross paths with the killer.