In 1944, American Brigadier General George Carnaby (Robert Beatty) is shot down over a heavily defended German fortress and imprisoned within. A rescue attempt is at once is launched by British Intellegence, since the General must be liberated before being made to reveal Allied plans for an invasion of France. As the mission unfolds, however, double and triple Agents begin to appear in the ranks of the rescue team, with the added mystery of American Lieutenant Morris Schaffer (Clint Eastwood) assigned to the mission for reasons unknown.—Anthony Hughes