A young commissioner investigates the murder of a girl, which took place the previous night in a tram carriage. In order to solve the case, the commissioner is willing to do anything, even to jeopardize the life of his girlfriend.

Luca and Stefania and their newborn baby move into a house on the coast of Lazio, unaware that their neighbor has just killed his wife. Tense, claustrophobic, dreamlike episode, emblem of Dario Argento's direction.

The constant sensation of imminent danger and the "black" climate typical of Dario Argento's production: in the last episode, a woman tells of having witnessed a murder, but, having no evidence to provide, she is not believed.

A patient in a psychiatric hospital appears to be the perpetrator of a homicide. The police try to track him down, while a girl who is trying to steal a doll comes across an ambiguous individual.