Six gentlemen, one goal: the destruction of Hitler's war machine. In the spring of 1939, a top-secret organization was founded in London: its purpose was to plot the destruction of Hitler's war machine through spectacular acts of sabotage. The guerrilla campaign that followed was every bit as extraordinary as the six men who directed it. One of them, Cecil Clarke, was a maverick engineer who had spent the 1930s inventing futuristic caravans. Now,...