Little boy learns of his stepmother's infidelity and later witnesses a murder... but the shocks have thrown him into a hysterical paralysis, and it's almost impossible for him to communicate anything to anybody.

Irene is a young housewife and mother who tries to raise her young family, love her husband and keep her home all the while studying her masters' degree. Mario, her husband, is a good man, but he's tied by convention. When she has a strange mishap one day, her domestic life is catapulted in a whirl of horror and violence that will tear the fabric of her very existence apart.

Class differences in Mexican society are expressed in the life and behavior of a young couple member of the burgoisie that will soon become parents, in contrast to their servant and the fatal consequences she suffers due to an unwanted pregnancy.