When a client drops dead during Lexi's spin class, she's not too surprised. After all, it's a tough class. But within days, another death occurs, this time on the treadmill. Then, when her running partner bites the dust, it becomes personal.

Sent undercover, Lexi takes a job as Montgomery's newest gym instructor in a bid to find the killer. With her professional and personal lives headed on a collision course, Lexi is glad to take the case. Now she only has to convince her boss, and new boyfriend, Solomon, that she's ready to solve her own case after she learns a disturbing connection between the victims. Faced with complex and dangerous circumstances, Lexi needs all of her past experience in order to catch the killer before another person falls victim.

To make matters even more challenging, Lexi's best friend, Lily, is planning for better or worse with Lexi's brother. Just one problem: All the local wedding boutiques have been repeatedly targeted by a highly organized gang of thieves. Roped into surveillance, rather than taking any chances and losing her best friend's dress, which would ruin the wedding, Lexi risks having too much to handle. The only thing she has to do is put a killer behind bars, save the dress, and save the day.... Piece of cake!