U.S. Army Captain Frank Hawthorne returns to Germany, against orders, to testify at the Nuremberg trials. He's attempting to save the life of Johann von Biehn, a former Nazi Officer. No one at the trials knows that three years ago, at the height of the war, Frank had been sent to kill the very man he is now defending — and that Johann is the love of his life. Frank must not reveal what happened between them during the war, but that leaves Frank with hardly any evidence to counter Johann's notorious career as a Nazi.