Producer-director Michael Powell, more usually associated with such get-away-from-it-all films as A Matter of Life and Death, Age of Consent, Black Narcissus and The Red Shoes, here made one of the most horrifying contributions to the cinema of the macabre since World War Two. Written by Leo Marks, who co-scripted the equally controversial Twisted Nerve, it tells of a psychopathic young cameraman who photographs his victims' terrified death agonies. The murders themselves are horrifyingly tense, and Carl Boehm couldn't be bettered as the psychopath. It makes gripping, adult entertainment: a rattling good nightmare thriller with no let up in the tension - but nasty with it and not recommended for the squeamish.

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