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The film begins with the following written statement: "In October 1937, a man crossed the English Channel knowing that the success or failure of his confidential mission could mean victory or defeat for his people." Robert Buckner's onscreen credit reads "Screen Play and Produced by." According to a news item in Daily Variety, Warner Bros. intended the film as a vehicle for Humphrey Bogart and Eleanor Parker. Katina Paxinou was borrowed from Paramount for the film. Confidential Agent marked Wanda Hendrix's film debut.