 Later Mr. Hardy tells the boys that there have been a number of hijackings against that firm, the Ortiz Trucking Company, and that he's going to Washington the following day to help the FBI investigate the hijackings.Initially, Frank, Joe and Chet work undercover as drivers at the Ortiz Trucking Company before Joe finds himself hijacked by one of the gang.Tracking the gang down, Frank, Joe & Chet stow away on a ship named the Mary Malone and find themselves facing the gang, a group of corrupt officials who plan to use nuclear weapons on every major city on Earth to take over the world.