When Robert Smedley is determined to prove that his wife is cheating, Raisin Investigations immediately offers to help. Unfortunately for Agatha, Mabel Smedley appears to be the perfect wife, young and pretty and a regular volunteer at church. Although Smedley's case doesn't look promising, Agatha's attentions are diverted when she stumbles across the body of missing teenager, Jessica Bradley. In a sudden gesture of kindness (and good public relations), Agatha offers to investigate Jessica's death free of charge. As Agatha juggles her two biggest cases, things are turned upside down when Robert Smedley is found poisoned in his office. The prime suspect, his sainted wife Mabel, immediately hires Agatha to find the real killer.