While taking a break from shooting a horror film, actor Michael Stanford (Stefano Patrizi) visits his mother (Anita Strindberg) at their old mansion. The only other person on the property is Oliver (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 during a psychotic episode when he was a child. He is immediately suspected as the murderer when his friends start getting killed.