Drowning by Numbers is a 1988 British film directed by Peter Greenaway. The story centers on three women — a grandmother, mother and daughter — each named Cissie Colpitts. As the story progresses each woman successively drowns her husband. One in a tin bath, one in the sea and in this clip Joely kills her hubby in a swimming pool.
The three Cissie Colpittses are played by Joan Plowright, Juliet Stevenson, and Joely Richardson.