Harvey Landon

English adventurer Harvey Landon agrees to help his old Oxford friend, Don Vargas, who is plotting the overthrow of a South American government. The Revolutionaries, however, are without aircraft and, to obtain their supply, Landon volunteers to take a letter out of the country to a mysterious Mr. Delgado in New York. Complications begin as Landon is stalked on board the New York-bound oil tanker by two agents intent on killing him and stealing the letter.

English adventurer Harvey Landon is alone in New York - wanted by the police and with only a few dollars in his pocket. Then Theodore Cranefield offers him a job that he can't afford to refuse. Soon he is driving south with a gunman named Gregg to a rendezvous in Florida with the so-called El Aguila, Ramon Arturo Alvarez, and the tough young Pete. The drama swiftly moves across the hurricane-swept Gulf of Mexico to a country shortly to be ravaged by a volcanic eruption, an earthquake and a revolution....