"You have a discreet officer whom you can trust?" he asked.

"Certainly. A dozen."

"I want only one."

"And here he is," said the Commissaire.

They were descending the stairs. On the landing of the first floor Durette, the man who had discovered where the cord was bought, was still waiting. Hanaud took Durette by the sleeve in the familiar way which he so commonly used and led him to the top of the stairs, where the two men stood for a few moments apart. It was plain that Hanaud was giving, Durette receiving, definite instructions. Durette descended the stairs; Hanaud came back to the others.

"I have told him to fetch a cab," he said, "and convey Helene Vauquier to her friends." Then he looked at Ricardo, and from Ricardo to the Commissaire, while he rubbed his hand backwards and forwards across his shaven chin.

"I tell you," he said, "I find this sinister little drama very interesting to me. The sordid, miserable struggle for mastery in this household of Mme. Dauvray—eh? Yes, very interesting. Just as much patience, just as much effort, just as much planning for this small end as a general uses to defeat an army—and, at the last, nothing gained. What else is politics? Yes, very interesting."

His eyes rested upon Wethermill's face for a moment, but they gave the young man no hope. He took a key from his pocket.

"We need not keep this room locked," he said. "We know all that there is to be known." And he inserted the key into the lock of Celia's room and turned it.

"But is that wise, monsieur?" said Besnard.