Fall 1944. Germany is losing, and the Americans are starting to hope they'll be home for Christmas. But Lieutenant Colonel Otto Skorzeny, "Hitler's Commando", famed for his daring rescue of the imprisoned Mussolini, has just received orders for Operation Greif: he is to assemble a new brigade of 2,000 men, all of whom speak English, and send them behind Allied lines disguised as GIs, where they will wreak havoc in advance of a savage new offensive. And from those men, Skorzeny is to select a smaller group, made up of the 20 most highly skilled commandos fluent in American culture, to attempt an even more sinister mission - the second objective - which, if completed, not only will change the course of the war, but will change the course of history.