Human Cargo: Bonnie Brewster and "Packy" Campbell, rival reporters on competing newspapers, team up to put an end to a smuggling gang that brings illegal aliens to the United States, and then makes further victims of them by extortion payments. They go to Vancouver, Canada and board a ship carrying aliens. But the gang recognizes them as reporters and gang-henchmen Tony Scula (Ralf Harolde) and Ira Conklin take them off the ship. But Campbell recognizes Scula as the gunman who killed Carmen Zoro.