Suppose he were boldly to enter the room on the left of the passage. Would the mere fact of his having been admitted to the house be sufficient? Perhaps a further password would be required, or, at any rate, some proof of identity. The doorkeeper clearly did not know all the members of the gang by sight, but it might be different upstairs. On the whole it seemed to him that luck had served him very well so far, but that there was such a thing as trusting it too far. To enter that room was a colossal risk. He could not hope to sustain his part indefinitely; sooner or later he was almost bound to betray himself, and then he would have thrown away a vital chance in mere foolhardiness.

A repetition of the signal knock sounded on the door below, and Tommy, his mind made up, slipped quickly into the recess, and cautiously drew the curtain farther across so that it shielded him completely from sight. There were several rents and slits in the ancient material which afforded him a good view. He would watch events, and any time he chose could, after all, join the assembly, modelling his behaviour on that of the new arrival.