1972, Milano. We are just a few days before the general elections. The daughter of a well-known professor is found dead. Mr Bizanti editor in chief of newspaper "Il Giornale", in agreement with its owner Mr. Montelli, decides to charge of following the story the junior Roveda and the senior Lauri. At one point, some elements indicates senator Boni as a possible murderer. All the "old guard" within "Il Giornale" drives articles in order to underline responsibilities of senator Boni. But young Roveda doesn't surrender and continues to search for the truth.

With Argento's trademark visual style, linked with one of his more coherent plots, Tenebrae follows a writer who arrives to Rome only to find somebody is using his novels as the inspiration (and, occasionally, the means) of committing murder. As the death toll mounts the police are ever baffled, and the writer becomes more closely linked to the case than is comfortable.

Yor, an extremely blond prehistoric warrior, comes to question his origins, particularly with regard to a mysterious medallion he wears...