Along a beautiful stretch of beach sits a state institution for the criminally insane. Among its inmates are a man who killed his wife with a wine bottle; an ex-butcher who put strange substances into meat; and a man who pushed his daughter out of a 40-story window.

When an inmate is found dead on the beach, the rest of the men eye each other coldly - for each of them had a motive to murder the unpopular victim.