This movie was derived from a non-fiction book, "The Ripper File", by two television scriptwriters, John Lloyd and Elwyn Jones, who, in turn, took it from their scripts for a television documentary series, Jack the Ripper (1973). The gimmick of the series was that the Ripper murders were examined, not by real-life experts, but by two fictional television detectives, Charlie Barlow and John Watt (played by Stratford Johns and Frank Windsor), central characters first depicted in the long-running Z Cars (1962) series, to which both Jones and Lloyd had contributed. A third writer for that series, John Hopkins, also wrote the script for this movie.

Film

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