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Fans of Doctor Who should know that a callbox is the British term for a police telephone booth. It stands to reason, then, that a detective should figure prominently in the 1932 The Callbox Mystery. That detective is Inspector Layton (Harold French, who later became a prolific director), who at present is investigating a suicide. Layton falls in love with the victim's daughter (Wendy Barrie), who doesn't believe that her father killed himself. The inspector and the girl join forces to prove that this suicide, and several other similar cases, were actually cold-blooded murders.