House on the Edge of the Park (1980)
Two low life punks invite themselves to a party at a posh villa and after being taunted by their snobbish hosts, hold everyone hostage and subject them to various forms of torture and mayhem
Tenebrae (1982)
An American novelist visiting Rome to promote his latest book is stalked and harassed by an obsessed fan who is committing a string of murders that appear to be tributes to his work