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Philip Follows A Pretty Face.
It was late in the afternoon when Philip's instructions came from the inspector.

They were tersely official in form, gave him all necessary authority, and ordered him to leave for Le Pas that night.

Pinned to the order was a small slip of paper, and on this MacGregor had repeated in writing his words of a few hours before: "Whatever happens, bring back your prisoner." There was no signature to this slip, and the first two words were heavily underscored.

What did this double caution mean?
Coming from a man like MacGregor, who was as choice as a king of his advice, Philip knew that it was of unusual significance.