"You see," explained Alden's voice out of the gloom, "farther along are open rails and dense bushes. That's where we're going to watch from. We'll see every soul that comes up."
"You're stone sure it's to-night they arranged?"
Patiently, Alden replied: "Stone sure."
"Because," drawled Oppner, stumbling along in the darkness, "this is not in my line."
"Sss!" came from close at hand.
Mr. Oppner started.
"That you, Martin?" from Alden.
"Yes; no one has gone in yet. But a ground floor room is lighted up, and also the conservatory."
"Right."
There was a momentary faint gleam of light. Mr. Alden was consulting his electrically-lighted watch.