The Devil's Mate is a 1933 American pre-Code mystery film directed by Phil Rosen, starring Peggy Shannon and Preston Foster.

As murderer Maloney is being executed in the electric chair, he's willing to expose an underworld mob boss.

Inspector O'Brien suspects McGhee, a ward healer and friend of Maloney; Parkhurst, a scholar, philanthropist, and candidate for the prison board; Clinton, a friend of Parkhurst; or Natural, a reporter for the "Chronicle" newspaper.

Since McGhee is a nonsmoker and found in possession of an empty cigarette case, he is arrested.

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