Tenebrae (lit. '"darkness"', also known as Tenebre) is a 1982 Italian giallo film written and directed by Dario Argento. The film stars Anthony Franciosa as American author Peter Neal, who – while in Rome promoting his latest murder-mystery novel – becomes embroiled in the search for a serial killer who may have been inspired to kill by his novel. John Saxon and Daria Nicolodi co-star as Neal's agent and assistant, respectively, while Giuliano Gemma and Carola Stagnaro appear as detectives investigating the murders. John Steiner, Christian Borromeo, Lara Wendel, Mirella D'Angelo, Veronica Lario and Ania Pieroni also feature in key supporting roles.