Peter Neal (Tony Franciosa) a popular American writer of mystery novels, arrives in Rome to go on a tour promoting his latest novel, Tenebrae
. Shortly after his arrival, a series of horrible murders occurs, patterned after the killings in his book. One victim is found with several pages of
stuffed in her mouth. Although the police are baffled, Neal decides to launch his own investigation, with the aid of his agent (John Saxon) and his staff. After several virtually plotless, surrealistic splatter movies (SUSPIRIA; INFERNO), director Dario Argento made a return with UNSANE
to the sort of suspense thriller--such as his seminal BIRD WITH THE CRY...