O’Hara nudged Moriarty, and Moriarty nudged O’Hara; but neither made a sound. They were not likely to be seen—­the blackness of the vault was too Egyptian for that—­but they were so near to the chairs that the least whisper must have been heard. Not a word had proceeded from the occupants of the chairs so far. If O’Hara’s suspicion was correct, and this was really the League holding a meeting, their methods were more secret than those of any other secret society in existence. Even the Nihilists probably exchanged a few remarks from time to time, when they met together to plot. But these men of mystery never opened their lips. It puzzled O’Hara.

The light of the candle was obscured for a moment, and a sound of puffing came from the darkness.

O’Hara nudged Moriarty again.

“Smoking!” said the nudge.

Moriarty nudged O’Hara.

“Smoking it is!” was the meaning of the movement.

A strong smell of tobacco showed that the diagnosis had been a true one. Each of the figures in turn lit his pipe at the candle, and sat back, still in silence. It could not have been very pleasant, smoking in almost pitch darkness, but it was breaking rules, which was probably the main consideration that swayed the smokers. They puffed away steadily, till the two Irishmen were wrapped about in invisible clouds.

Then a strange thing happened. I know that I am infringing copyright in making that statement, but it so exactly suits the occurrence, that perhaps Mr Rider Haggard will not object. It was a strange thing that happened.

A rasping voice shattered the silence.

“You boys down there,” said the voice, “come here immediately. Come here, I say.”