A man who lives apart, not to others but alone, is exposed to obvious psychological dangers. In itself, the practice of deception is not particularly exacting; it is a matter of experience, of professional expertise, it is a facility most of us can acquire. But while a confidence trickster, a play-actor, or a gambler can return from his performance to the ranks of his admirers, the secret agent enjoys no such relief. For him, deception is first a matter of self-defence. He must protect himself not only from without but from within, and against the most natural of impulses; though he earn a
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