A psychic finds herself tapping into the "energy" of a deceased phone operator. She also finds that her friends soon begin dying mysteriously. An investigator determines to track down the cause.
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.