"It would be worth big money to know just what is being said in there," returned Rouse regretfully.
"Of course, and that's what I am bound to find out."
"How do you propose to do it?" asked Rouse, in surprise.
"There is a room overhead."
"Undoubtedly."
"And in that room is a ventilating flue, which runs down through the room below and out through the roof above."
"I see! I see!" exclaimed Rouse, in high glee. "We have only to reach the ventilator to hear all that is going on in Bissell's room."
"Right, provided the ventilator in twenty-four is not closed."
"I've no fear of that—they're never closed."
"Very good; then we are likely to hear something to our advantage."