Summary: The wife and mistress of the abusive headmaster of a boy's school plot and carry out his murder. They dump his body in the murky swimming pool at the school and await for it to surface. After several days, some unusual circumstances point to clues that he is not dead after all.

Genres: Suspense/Thriller, Horror, Mystery

Country: USA

Directed By: John Badham

Written By: Thomas Narcejac, Pierre Boileau

Starring: Michael Lerner, Sam Waterston, Tuesday Weld, R.G. Armstrong, Lucille Benson, Joan Hackett

More information at the Internet Movie Database