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Working titles for this film were The Lone Wolf's Daughter and The Lone Wolf. Modern sources indicate that although the script for Columbia's 1929 film The Lone Wolf's Daughter (see AFI Catalog of Feature Films, 1921-30; F2.3165) was used as the basis for this film, the story was changed completely following John Latimer's assignment to the screenplay. Louis Joseph Vance's "The Lone Wolf" stories and novels provided the basis for at least twenty-four films made between 1917 and 1949. Following the 1938 release of its The Lone Wolf in Paris, Columbia committed itself to making a series of "The Lone Wolf" films with Warren William starring as the gentleman sleuth, and initiated the series with this film. Following the release of The Lone Wolf Spy Hunt, William starred in eight "The Lone Wolf" pictures, until 1946, when Gerald Mohr took over the role in The Notorious Lone Wolf. The first film based on the "The Lone Wolf" novels was the 1917 Herbert Brenon production The Lone Wolf, which featured Bert Lytell as detective "Michael Lanyard" (see AFI Catalog of Feature Films, 1911-20; F1.2583). Other films based on the "The Lone Wolf" novels, which were not part of Columbia's series starring Warren William, include: the 1924 independent film The Lone Wolf, directed by S. E. V. Taylor and starring Dorothy Dalton and Jack Holt (see AFI Catalog of Feature Films, 1921-30; F2.3163); the 1935 Columbia film The Lone Wolf Returns; and The Lone Wolf and the Lady, directed by John Hoffman and starring Ron Randell. In April 1954, the first episode of the The Lone Wolf television series (also known as Streets of Danger) had its non-network television premiere. The half-hour show was produced by Jack Gross and Philip Krasne and starred Louis Hayward as "Michael Lanyard." This film marked British stage director Peter Godfrey's first screen effort. Modern sources note that the name of "Lanyard's" valet, known in previous "The Lone Wolf" films as "Jenkins," was changed to "Jameson" for this and other films. For a list of additional titles in the "The Lone Wolf" series, consult the Series Index.