Helen Hawthorne and her new hubby Phil have opened their own P.I. agency and their very first client is Shelby, who thinks her husband is developing a killer body for another woman.
To keep track of the suspected cheater, Helen gets a dead-end job at Fantastic Fitness, where she has to pump iron to stay employed. Then the budding agency takes on a murder case, and Helen has to move her workouts to the early morning just to keep up. With so much weight on her aching shoulders, will Helen catch a killer-or just drop dead from exhaustion?