It was only yesterday that Six-Packs gym owner Celeste Jones helped its resident ghost Lennie solve a third murder. Little did she know she unwittingly signed up to be the sleuthing ghost's sidekick when she bought the flailing health club. Lennie must solve five murders before he can enter the afterlife to atone for being a bad human while alive.

He may drive her bonkers, but she simply can't say no when he asks for help. Plus, it's not like she has a choice the way the bodies are piling up at Six-Packs. Thankfully, she has befriended an FBI agent who—so far—has helped her keep the murders under wraps. A very hot FBI agent who she thinks about way too often.

Then Six-Packs' most prestigious member falls off a treadmill and dies. Lennie has inside information the incident wasn't an accident. It's only a matter of time before the authorities realize that. Celeste must find the killer before that happens to have a chance of keeping this murder under wraps, too, or it may very well be the end of Six-Packs.