Antropophagus (1980)

Director: Joe D'Amato
Cast: Bob Larson, Margaret Mazzantini, Mark Bodin, Rubina Rey, Saverio Vallone, Serena Grandi, Simone Baker, Tisa Farrow

Synopsis:

Tourists take a boat to a remote island, where they find that most of the people have disappeared, and something is stalking them. They find a hidden room in the big mansion on a hill, and an ancient diary, which gives them clues to the source of the terror.