Secret Killer (1965)

aka’s: Le Vampire De Düsseldorf/El Asesino De Düsseldorf/La Belva Di Dusseldorf/The Vampire Of Dusseldorf

Peter (Robert Hossein) sees himself as a ladies man and spends his nights cruising the seedy dives of Dusseldorf looking for women, but when he gets rejected, he transforms into a brutal killer. Also stars Marie-France Pisier and Roger Dutoit.