"We're a couple of easy marks!" he laughed.
"Easy marks is no name for, it!"
"Well, what'll we do now to get out?" Tommy asked. "First thing we know, it'll be daylight, and then Will and George'll be calling out the police to find us. We ought to get home before they wake."
"I'm willing!" declared Sandy. "I'd like to be in my little bed this minute! I've had about enough of this foul air!"
The boys passed along until they came to the second trail sign and then stopped. Tommy pointed down to it with a hand which was not quite steady and looked up into his chum's face with frightened eyes.
"That's been moved!" he said.
"How do you know it's been moved?"
"Because you had the side stone on the other edge."
"I don't think I did!" argued Sandy.
The boys puzzled over the situation for a few moments, and then proceeded down the chamber looking for the tramway rails.