A pianist is searching for his sister who has become a prostitute.A sadistic killer is preying on prostitutes.He kills his victims with a razor.Police hunt for the girl and the killer."American Nightmare" by Don McBrearty is a Canadian giallo with some slasher elements.The look of the film is dirty and grimy and there is enough sleaze and nudity to satisfy even the most demanding smut-peddlers.There is one extremely surprising twist involving the pianist's father that truly knocked me out of my seat.It's nice to see Michael Ironside in a small role as the cop.He was really believable as the killer in another overlooked Canadian slasher "Visiting Hours".Finally I must say that the killings are fairly brutal and effective for example one stripper is drowned in a bath-tub and the killer cuts her wrists.The water becomes red with her blood.So if you are a fan of Canadian exploitation cinema you can't miss "American Nightmare".7 out of 10.