Two men were crossing the almost empty market square toward the Café Biribi, moving without haste over the sunny pavement.

"Hoffman and Meier," whispered Halkett. "There go our promising young rodents straight toward the old rat's nest! It won't do for them to catch sight of me.... Wait a moment! There they go—into the Café Biribi! Follow them—they don't know you. Keep your eye on them.

"I'll stroll over to the quay and dangle my legs on the river wall. If you need me, come out on the café terrace and beckon."

"Would it do to hand over that pair to the police? They are German spies, are they not?"

"They are. But at present they are likely to be useful. If Wildresse is in the café or the cabaret, they are sure to reveal the fact to us. Better go in and keep your eye on them. If you want me, I shall be smoking my pipe on the river wall across the street."

He nodded and strolled over toward the little tree-shaded quay, filling his pipe as he sauntered along. Warner continued on to the café, entered, seated himself against the shabby wall, picked up an illustrated journal, ordered bitters, and composed himself to enjoy the preprandial hour sacred to all Frenchmen.

Without looking he was aware that the two men, Meier and Hoffman, seated at a table near the cashier's desk, had noted his arrival and were steadily inspecting him.

But he did not look in their direction; he turned the pages of the illustrated paper, leisurely, until the waiter brought his Amer Picon and a chilled carafe. Then he measured out his water with the unstudied deliberation of an habitué, stirred the brown liquid, sipped it, and, turning to another page of his paper, let his eyes rest absently on the two men opposite.

By that time neither of them was even looking at him. They were drinking beer; their heads were close together and they had turned so that they were facing each other on the padded leather wall settee.

It was impossible to hear what they were saying; they spoke rapidly and in tones so low that only the vibration of their voices was audible in the still room.