After the explosion of an atomic bomb, a handful of people at the mercy of a disturbed millionaire.

Andrés, an unsuccessful young pianist, witnesses a murder; but keeps silent for fear that the man he has seen next to the corpse will retaliate against him.

A recent widow has invited a group of family friends to her large and secluded country home. However, what the guests don't know is that the reason they've been assembled is that their host suspects one of them might be her husband's killer and she's intent on uncovering the identity of his murderer. As the guests begin to suspect each other, revealing long-kept and sinister secrets in the process, an unknown, black-gloved killer begins bumping them off in a variety of nasty ways.

Forced to support herself, her children, her physically incapacitated husband and her obtrusive brother and mother, a downtrodden working woman contracts tuberculosis. She is granted a brief vacation at a health spa, where a whole new world — and potential new life — is opened up to her.