"We see it through together, then, though God knows whither it will lead us."

"In the first place," I interrupted, "since you have left the chest unguarded——"

"I locked the door."

"What is a mere lock where Fu-Manchu is concerned?"

Nayland Smith laughed almost gaily.

"Really, Petrie," he cried, "sometimes I cannot believe that you mean me to take you seriously. Inspector Weymouth has engaged the room immediately facing our door, and no one can enter or leave the suite unseen by him."

"Inspector Weymouth?"

"Oh! for once he has stooped to a disguise: spectacles, and a muffler which covers his face right up to the tip of his nose. Add to this a prodigious overcoat and an asthmatic cough, and you have a picture of Mr. Jonathan Martin, the occupant of room No. 239."

I could not repress a smile upon hearing this description.

"No. 239," continued Smith, "contains two beds, and Mr. Martin's friend will be joining him there this evening."