Written and directed by Robert Arthur and David Kogan, the radio series was sponsored by Adam Hats.

Cast members included Jackson Beck, Lon Clark, Roger DeKoven, Elspeth Eric, Wendell Holmes, Bill Johnstone, Joseph Julian, Jan Miner, Santos Ortega, Bryna Raeburn, Frank Readick, Luis van Rooten, Ann Shepherd, Lawson Zerbe and Bill Zuckert.

Sound effects were by Jack Amrhein, Jim Goode, Ron Harper, Walt McDonough and Al Schaffer.

When their Native American guide is mysteriously and brutally attacked, the two, now lost in the darkness, conclude that the descendants of the wagon train are still living in the cave.

[2] Grace Publishing's 1951–52 Mysterious Traveler digest-sized magazine ran for five issues with cover paintings by famed pulp illustrator Norman Saunders.