Adapted for radio as part of the "Lux Radio Theater" on Sept. 29, 1947, with Raines, Price, and O'Brien reprising their roles.
Producer Jerry Bresler's first Universal-International production.
Second cameraman Irving Glassberg's first film as director of photography.
Universal recycled several elements of the plot of this thriller for "P.J.", a 1968 private-eye thriller starring George Peppard.
The game Colby and Regan are playing is Carom billiards, which is played with three balls on a table without pockets.