He stepped across the room and rang the bell. Tredwell answered it.

“A gentleman arrived with me this evening, Tredwell.”

“Yes, sir, a foreign gentleman.”

“Quite so. Will you kindly ask him to join us here as soon as possible?”

“Yes, sir.”

Tredwell withdrew.

“Entry of the trump card, the mysterious Monsieur X,” remarked Anthony. “ Who is he? Can anyone guess?”

“Putting two and two together,” said Herman Isaacstein, “what with your mysterious hints this morning, and your attitude this afternoon, I should say there was no doubt about it. Somehow or other you’ve managed to get hold of Prince Nicholas of Herzoslovakia.”