Sadie Weinstein, wife and joint owner with her husband, Nathan, of Weinstein’s Grocery, is a wacky amateur defective detective modeling herself after Agatha Christie’s Hercule Poirot and Miss Marple. She enlists the help of the Cereal Killer Squad in her quest to aid the police capture the infamous Cereal Killer who murders dope pushers and sprinkles cereal on their bodies. Nathan objects to the squad of two prostitutes, a guidance counselor, an aunt of a victim, and an Indian psychic, but zany Sadie doesn’t heed his warning. Her persistent sleuthing fails to uncover a single clue until she comes face to face with the Cereal Killer who finally loses his appetite for cereal and murder.