The tragic love story between Guido, the owner of a marble quarry and Luisa, the humble daughter of one of his employees, ends up in her giving birth to a baby boy. Giulio's mother is against them at first she takes her son abroad with an excuse and then has her grandson kidnapped making Luisa think the boy died in a fire.
Several young girls were killed. Policeman Matthaei travels to the region where it happened and searches a child that looks similar to the ones that were murdered. He finds one and stays with her and her mother, not telling them that he is waiting for the killer to start his bloody work one more time ...