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Peter Neal (Anthony Franciosa) is an American writer of violent horror novels whose books are tremendously popular in Europe. In Italy to promote his latest work, entitled Tenebrae, he is accompanied by his literary agent Bullmer (John Saxon) and his adoring assistant Anne (Daria Nicolodi). He is unaware that he is also being followed by his embittered ex-wife Jane (Veronica Lario). Immediately prior to Neals arrival in Rome, a beautiful young shoplifter (Ania Pieroni) is brutally razor-slashed to death by an unseen killer. The murderer sends Neal a letter informing him that his books have inspired him to go on a killing spree. Neal immediately contacts the police, who put Detective Giermani (Giuliano Gemma) in charge of the investigation, along with the detectives female partner Inspector Altieri (Carola Stagnaro).