In 1942 radar expert Jack Nissenthall volunteered for a suicidal mission to join a combat team who were making a surprise landing at Dieppe in occupied France. His assignment was to penetrate a German radar station on a cliff above 'Green Beach'. Because Nissenthall knew the secrets of British and US radar technology, he was awarded a personal bodyguard of sharpshooters. Their orders were to protect him, but in the event of possible capture to kill him. His choice was to succeed or die. The story of what happened to him and his bodyguards in nine hours under fire is one of World War II's most terrifying true stories of personal heroism.