Countering Hitler's Spies

This WWII espionage history reveals how a British counterintelligence program turned Nazi spies into valuable double agents.

Far from the battlefields of the Second World War, a secret conflict of intelligence and counterintelligence was being waged. As German spies infiltrated the United Kingdom, they were captured by MI5—and offered a deal. Through the Double Cross System, they could turn on thei...