The film's plot centres on three married women — a grandmother, her daughter, and her niece — each named Cissie Colpitts. As the story progresses, each woman successively drowns her husband. The three Cissie Colpittses are played by Joan Plowright, Juliet Stevenson and Joely Richardson, while Bernard Hill plays the coroner, Madgett, who is cajoled into covering up the three crimes.