United States Federal agent Rigby travels to the Central American island Carlotta to investigate a stolen aircraft engines smuggling racket.

Engineer Johnny Munroe is enlisted to build a railroad tunnel through a mountain to reach mines. His task is complicated, and his ethics are compromised, when he falls in love…

Kit Madden is traveling to Hollywood, where her best-selling novel is to be filmed. Aboard the train, she encounters Marines Rusty and Dink, who don’t know she is the author…

The Falcon travels to Mexico where he gets involved with murder and a mysterious painting.