"I would say the most help I got was from my dad. My dad is a civil engineer in Switzerland; he's 90 years old now, so he's no longer active as a civil engineer, but still a very active person."

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The Man Who Never Was,' by Ewen Montagu, remains the best book about wartime espionage written by an active participant - incomplete, and dry in parts, it nonetheless summons up the ingenuity and sheer eccentricity of those who played this strange and dangerous game.

— Ben Macintyre