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The Criminal at Large in this quota quickie murders his victims in the dark of night. There seems to be a pattern to the killer's activities, but darned if Chief Inspector Tanner (Norman McKinnel) can figure it out. It looks as though dilettante sleuth Lord Lebanon (Emlyn Williams) will have to come to Scotland Yard's rescue, as the killer stalks his prey in a musty old castle. Criminal at Large was based on Edgar Wallace's stage play The Frightened Lady (which was also the film's alternate title). Wallace also worked on the screenplay -- one of his final assignments before his untimely death in 1933.