Deception is a sort of seduction. In love and war, adultery and espionage, deceit can only succeed if the deceived party is willing, in some way, to be deceived.
'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.