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Tomorrow at Seven is one of those "you will die at the appointed hour" murder mysteries which flooded the market in the early 1930s. An unknown killer considerately informs his victims-to-be of their imminent demises by mailing them the Ace of Spades-hence his nom-de-murder, "Mr. Ace." Novelist Chester Morris and bumbling detectives Allen Jenkins and Frank McHugh team up to ascertain the true identity of Mr. Ace before he can claim leading lady Vivienne Osborne as his next victim. Tomorrow at Seven was concocted by Ralph Spence, who during the 1920s became famous as the king of the subtitle writers. The film was produced independently by Jefferson Pictures, and distributed by RKO Radio.