While taking a break from shooting a horror film, actor Michael Stanford (played by Stefano Patrizi) visits his mother (Anita Strindberg) at their old mansion. The only other person on the property is oliver (played by John Richardson), the eccentric butler. Michael’s girlfriend, Deborah (Silvia Dionisio), and some of their filmmaking friends join Michael at the mansion for a couple of days rest. Michael reveals that he murdered his father (who was a famous orchestra conductor) during a psychotic episode when he was a child. He is therefore the primary suspect when his friends start getting killed.