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The Glass Cage is a 1955 British second feature mystery film, directed by Montgomery Tully and starring John Ireland, Honor Blackman and Sid James. It was made by Hammer Film Productions. The screenplay was by Richard H. Landau based on the 1945 novel The Outsiders by A. E. Martin. J. Elder Wills was the art director. Filming began on July 19, 1954, and it was trade shown a year later. The film's original working title was supposed to be The Outsiders, but it was changed to The Glass Cage instead.