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A pattern is developing - murder committed by a man who stops cars being driven by prosperous businessmen - and Roger ('Handsome') West of Scotland Yard must solve the case. Muriel Arlen waits for husband Wilfred, but when the key turns in the door it is a masked stranger that enters the house and knocks her out with the butt of a gun. West has problems in getting to the truth as people he is trying to protect lie, and his assistant falls in love with a witness. Meanwhile, the murderer is at large ...