When Mo and Tony try to figure out how to get married under the radar, it turns into a typical Sinful disaster. Meanwhile, Mo's sister Minnow has her own troubles.
She and her husband already have a full plate trying to open their new business and sell their cover to the residents of Sinful. But a murder after the grand opening of the fitness center leaves Minnow as the prime suspect. As the Sinful women work to find out who really killed Tabby (the stripper dance instructor) Jo offers her help. Along with Ida Belle and Gertie they find more trouble than answers on the way to solving the crime.