This is another who did it thriller from the master Dario Argento, its a great story as always with a killer on the loose and you never guess what happens until the big twist at the end, its not Argento's best but still good to have in the collection, some quality camera work and creepy music make it a classic still. The cast is good including a small part by John Saxon from a nightmare on elm street, there is some bloody gore as usual as expected from Argento, if your a fan then its a must in the collection.