“I will not, and what’s more, you daren’t kill me. You’d have the police on your tracks in no time.”

My interlocutor clapped his hands swiftly. Two Chinese attendants appeared as it were out of the blue, and pinioned me by both arms. Their master said something rapidly to them in Chinese, and they dragged me across the floor to a spot in one corner of the big chamber. One of them stooped, and suddenly, without the least warning, the flooring gave beneath my feet. But for the restraining hand of the other man I should have gone down the yawning gap beneath me. It was inky black, and I could hear the rushing of water.

“The river,” said my questioner from his place on the divan. “Think well, Captain Hastings. If you refuse again, you go headlong to eternity, to meet your death in the dark waters below. For the last time, will you write that letter?”