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Colonel March Investigates is a 1953 British film directed by Cy Endfield. The film comprises the three pilot episodes of the TV series Colonel March of Scotland Yard that were filmed in 1952, starring Boris Karloff. These episodes were "Hot Money", "Death in the Dressing Room" and "The New Invisible Man"., all adaptations of stories from the Department of Queer Complaints collection by John Dickson Carr. The screenplay was credited to "Leo Davis", disguising the involvement of blacklisted screenwriters Abraham Polonsky and Walter Bernstein.