But anyone who has really slipped inside has a million chances.

And this, remember, is one man in ten millions, a man whose brain never sleeps for a moment, who is quick to seize the slightest hint, who can piece a plan together out of a dozen bits of gossip.

It's like--it's as if the Chief of the Intelligence Department were suddenly to desert to the enemy ...

The ordinary spy knows only bits of unconnected facts.

This man knows our life and our way of thinking and everything about us.' 'Well, but a treatise on English life in time of war won't do much good to the Boche.' Sir Walter shook his head.