It is World War II, in the winter of 1943-44; U.S. Army Brigadier General George Carnaby, one of the chief planners of D-Day, is captured by the Germans when his aircraft is shot down en-route to Crete. He is taken to the Schloß Adler (Eagle Castle in German; hence the title), a fortress high in the Alps that is headquarters of the German Secret Service in southern Bavaria. A team of mainly British commandos is assembled and briefed by Colonel Wyatt Turner and Admiral Rolland of MI6, and led by Major John Smith and US Army Ranger Lieutenant Morris Schaffer. Their mission is to parachute in, infiltrate the Schloß Adler, and rescue General Carnaby before the Germans can interrogate him. Agent Mary Elison, an MI6 operative, accompanies the mission in secret, her presence known only to Major Smith.
World War II is raging, and an American general has been captured and is being held hostage in the Schloss Adler, a Bavarian castle that's nearly impossible to breach. It's up to a group of skilled Allied soldiers to liberate the general before it's too late.
