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A serial killer is keeping Chief Inspector Rowan (Gilbert Wynne) busy late at night, much to the frustration of his young wife, Jenny (Linda Marlowe). After being picked at random in a police lineup, self-styled lothario Pete Laver (Donald Sumpter) is arrogant and disdainful to Rowan, and he even makes crude remarks about Jenny when she stops by her husband's office. Pete is released for lack of evidence, and that evening, Jenny is slashed to death by the killer while showering. Choked with rage, Rowan shadows Pete relentlessly, hounding him night and day until he can catch him in a mistake. The maniac strikes again, murdering a prostitute, and Pete is stuck without an alibi, so it appears that the crime has been solved. Judge Lomax (Jack May), long known to be tough on crime and social decay, presides over the case, but in the preceding weeks, his wife and colleagues have noticed a change in his behavior. His temper is short, his demeanor is cold, and he sometimes appears disoriented. Soon it becomes apparent that the judge has been the culprit all along, donning a black leather suit and an ill-fitting wig to commit his crimes. Stoked on pornography and willing to resort to transvestism to elude capture, the judge falls completely under the spell of his dementia and is confronted by the police on the waterfront, pleading for help and waving a pistol. Also available under the titles He Kills Night After Night After Night, Night After Night, and Night Slasher.