He had gone but a block when the window at his back was lowered and his fare observed pleasantly:

"That you, Lanyard?"

The adventurer hesitated an instant; then, without looking round, responded:

"Wertheimer, eh?"

"Right-O! The old man had me puzzled for a minute with his silly chaffing. Stupid of me, too, because we'd just been talking about you."

"Had you, though!"

"Rather. Hadn't you better take me where we can have a quiet little talk?"

"I'm not conscious of the necessity—"

"Oh, I say!" Wertheimer protested amiably—"don't be shirty, old top. Give a chap a chance. Besides, I have a bit of news from Antwerp that I guarantee will interest you."

"Antwerp?" Lanyard iterated, mystified.

"Antwerp, where the ships sail from," Wertheimer laughed: "not Amsterdam, where the diamonds flock together, as you may know."

"I don't follow you, I'm afraid."

"I shan't elucidate until we're under cover."

"All right. Where shall I take you?"

"Any quiet café will do. You must know one—"

"Thanks—no," said Lanyard dryly. "If I must confabulate with gentlemen of your kidney, I prefer to keep it dark. Even dressed as I am, I might be recognized, you know."

But it was evident that Wertheimer didn't mean to permit himself to be ruffled.