Box 13 was a syndicated radio drama about the escapades of newspaperman-turned-mystery novelist Dan Holiday, played by film star Alan Ladd. Box 13 first aired in United States radio markets in October 1947.
To seek out new ideas for his fiction, Holiday ran a classified ad in the Star-Times newspaper where he formerly worked: “Adventure wanted, will go anywhere, do anything – write Box 13, Star-Times.” The stories followed Holiday’s adventures when he responded to the letters sent to him by such people as a psycho killer and various victims.