Box 13 is a syndicated radio drama that follows the adventures of Dan Holiday, a newspaperman-turned-mystery novelist played by actor Alan Ladd. The show is set around a simple premise: to generate story ideas for his mystery novels, Holiday places an advertisement in the local newspaper that reads, "Adventure wanted, will go anywhere, do anything, Box 13." Each episode deals with the adventures that transpire after Holiday receives a letter and responds to it. Along the way, Holiday solves mysteries, faces dangerous situations, and shares laughs with his secretary, Suzy. The show captures a lighthearted yet thrilling tone and manages to maintain a sense of mystery throughout each episode without relying heavily on grisly murders or hard-boiled detective themes.

A product of Mayfair Productions, Box 13 was aired on the Mutual Broadcasting System, as well as being syndicated. The show ran for 52 episodes between August 1948 and August 1949. Other notable cast members included Sylvia Picker as Suzy, Edmond MacDonald as Lt. Kling, and guest appearances by Betty Lou Gerson, Lurene Tuttle, Alan Reed, Luis Van Rooten, John Beal, and others. The series was produced by Richard Sanville with Alan Ladd as co-producer, and the program was directed by Vern Carstensen. The show's music was created by Rudy Schrager, while the scripts were penned by Russell Hughes. Although Box 13 failed to make the transition to television, it did inspire a comic book series, which was reimagined and published by ComiXology and Red 5 Comics in 2010.

Sources: archive.org, wikipedia.org, otrcat.com