AllMovie

As the curtain rises, the faithful butler to an elderly dowager is found murdered. The dowager herself is found nowhere -- she's completely disappeared, and foul play is suspected. Scotland Yard investigates, but the detectives are stymied by the fact that the suspects all have airtight alibis -- all supplied by the other suspects. Heroine Anne Grey tries to piece together the clues herself, and the results lead her into the clutches of a gang of jewel smugglers. Based on a play by Jack Celestin and Jack DeLeon, The Man at Six was released in the U.S. as The Gables Mystery, which was also the title of the 1938 remake.