Door Into Darkness

The Neighbor (original title: Il vicino di casa) tells the story of couple that move into an apartment with their newborn. Unbeknownst to the couple, the neighbor upstairs has a terrible secret. This episode marked the directing debut of Argento assistant Luigi Cozzi.

The Tram (original title: Il tram) is a mystery centering around the discovery of a dead woman's body in the titular location and a Detective's thought process on how she got there. Argento wrote and directed this episode under the pseudonym Sirio Bernadotte.

Eyewitness (original title: Testimone oculare) centers on a woman who witnesses a shooting. However, when she returns to the scene of the crime, the body is missing and the authorities do not believe her story. This episode was written by Argento and Cozzi. Although Roberto Pariante is credited with the direction, Argento went back and re-shot a significant portion of the episode.

The Doll (original title: La bambola) revolves around a lunatic who escapes from a mental asylum and begins stalking a young woman. This episode was directed by Mario Foglietti (although Cozzi did some uncredited directing on it).