Police Comissioner Datti is investigating the murder of a female doctor whose murderer seems to be a thirty-fivish year old man. Soon another murder follows: Pianist Robert Dominici's girlfriend is found killed. The killer also challenges Datti on the phone and says he can't be caught since he has a secret which makes him invulnerable. In the meantime the clues seems to point in strange directions...

A murdered couple return from the beyond to care for their two young children, as well as seek revenge against their killer, accept their children's step parents, and try to prevent their house from being sold.