In this gripping narrative, Ben Macintyre tackles one of the most famous prison stories in history and makes it utterly his own. During World War II, the German army used the towering Colditz Castle to hold the most defiant Allied prisoners. For four years, these prisoners of the castle tested its walls and its guards with ingenious escape attempts that would become legend. But as Macintyre shows, the story of Colditz was about much more than escape.

On the night of June 13th, 1944, a 12-man SAS unit parachuted into occupied France. Their objective: hit German forces deep behind the lines, cutting the rail-tracks linking Central France to the northern coastline. In a country crawling with enemy troops, their mission was to prevent Hitler from rushing his Panzer divisions to the D-Day beaches and driving the Allied troops back into the sea. It was a Herculean task, but no risk was deemed too great to stop the Nazi assault.

On a scorching September day in 1942, the Special Air Service (SAS), a special forces unit of the British Army, pulled off one of the most daring, top-secret ruses of the Second World War. The plan (sanctioned by Churchill): cover a grueling 2,000 miles of the Sahara desert to attack German general Erwin Rommel's seemingly impregnable port fortress in North Africa from the rear to break free and arm more than 30,000 Allied POWs.

Britain's Special Air Service - or SAS - was the brainchild of David Stirling, a young, gadabout aristocrat whose aimlessness in early life belied a remarkable strategic mind. Where most of his colleagues looked at a battlefield map of World War II's African theater and saw a protracted struggle with Rommel's desert forces, Stirling saw an opportunity: Given a small number of elite, well-trained men, he could parachute behind enemy lines and sabotage their airplanes and war matériel.

In 1942, in a quiet village in the leafy English Cotswolds, a thin, elegant woman lived in a small cottage with her three children and her husband, who worked as a machinist nearby. Ursula Burton was friendly but reserved, and spoke English with a slight foreign accent. By all accounts, she seemed to be living a simple, unassuming life. Her neighbors in the village knew little about her. They didn’t know that she was a high-ranking Soviet intelligence officer. They didn’t know that her husband was also a spy, or that she was running powerful agents across Europe.