Broadway gamblers stumble across a plan by Nazi saboteurs to blow up an American battleship.

Japanese communists attempt to take over Hawaii and only Dr. Jim Ransom can stop them.

England, 1940, during World War II. An MI5 officer, codenamed Jack King, infiltrates a network of conspirators, a British fifth column sympathetic to...

Javier Navarro, a Falangist, is ordered to infiltrate Republican Madrid to deliver a message to a member of the Fifth Column.