Presently he heard nearer sounds, and a key turned in the door.
As he sprang forward he was stopped, for the door shut, and he stood again in darkness.
"Where are you, Waters?" cried some one.
"Here!"
A hand found the young man's arm and closed there.
"Thank Heaven! They did not finish you."
"Is it you, Tom?"
"Briggs! I am one of the three who seized you at her command; but, by heavens, I can't see a human being, and a pard at that, die in a trap like this."
Waters uttered a responsive thanksgiving.
"The coast is clear. The way to the south is open for you, but you must hasten. In a minute the avenue of escape may be closed."