Murder Obsession (Follia Omicida)

While taking a break from shooting a horror film, actor Michael Stanford (Stephano Patrizi) visits his mother (Anita Strindberg) at their old mansion. 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 making himself the primary suspect when his friends start getting killed.