Jo Stevens’s evening with Rick isn’t going too well, so when she spots her friend Gemma a few lanes down at the bowling alley, she seizes the opportunity for a double date. When Gemma says she’d like to kill her sleazy boss, the two couples joke about forming a club to execute perfect murders. But when Jo stumbles upon a corpse of a woman the next morning, she realizes that murder is no laughing matter. Jo describes her gruesome discovery to Inspector Henrietta “Hen” Mallin who has her work cut out for her as the bodies count continues to climb.