Plot Summary:In the post-World War II years, the United States and Japan make efforts to strengthen their friendship and to become allies against the Communist threat exacerbated by the on-set of the Cold War. Famous Japanese sculptor Matsura (Tatsuo Saitô) creates a new sculpture symbolizing the growing friendship between Japan and the United States. The memorial features an eternal flame. The U.S. High Commissioner to Japan (Larry Keating) is given the honor and he agrees to light the monument's eternal flame. The Communist spy network in Japan sees an opportunity to sabotage the ceremony and to attempt to assassinate the U.S. High Commissioner. Communist Agent George Underwood (Edmond O'Brien) is entrusted with this task. At the same time, U.S. Intelligence officer Mark Fannon (Robert Wagner) makes a stopover in Tokyo while on a flight to South Korea. Due to the fact that he's lacking the mandatory Letter of Entry in order to enter or transit Japan, Fannon requests and receives the assistance ...