Upper-class geometry professor Juan and his wealthy, married mistress María José, driving back from a late-night rendezvous, accidentally hit a cyclist and run. The resulting tale of guilt, infidelity, and blackmail reveals the wide gap between the rich and the poor in Spain and surveys the corrept ethics of a society seduced by decadence.

Groundlessly jealous of his wife's romantic past, Enrico Fontana hires a private detective to finally determine whether she is fathful or not. Ironically, his suspicious attitude unconsciously brings his wife, Paola, together with Guido, a man with whom she had once been in love. Paola and Guido's past was clouded in tragedy. Giudo had been involved with Paola's close friend's death. Their passion rekindled once again, the lovers even get to the point...