A U.S. Army platoon, captured by Communists during the Korean War, is whisked to Manchuria for three nightmarish days of experimental drug-and-hypnosis-induced "brainwashing." The aftermath transforms one of the captors (decorated with the Congressional Medal of Honor) (Laurence Harvey) into an operational assassin with a mission ... and with a domineering mother (a menacing Angela Lansbury), who has intensions to promote her henpecked, Joseph McCarthy-like husband's political career. This classic spinetingler, which comes to a stunning -- and suspenseful -- climax at a political convention at Madison Square Garden, is a stunning cinematic triumph for director John Frankenheimer. With Frank Sinatra as another "brainwashed" officer who realizes that something is very, very wrong...