“Honest? Maybe it’s just a—a drain or something. Got a match?”

“There are some over by the furnace. Hold your horses!” Bob hurried out, and was back in a moment and was standing at the opening between the doors with a lighted match held toward the opening in the wall. As the little light grew they saw that the stones of the wall had been removed from a space of a foot above the floor and three feet high and some two feet wide. Around the opening so made cement had been applied in the form of a smooth casing.

The match flickered and went out, and in the succeeding gloom the two boys stared at each other with wide eyes.

“Would you dare go in there?” asked Laurie.

“Sure! Why not? It can’t be anything but a sort of cave underground. Wait till I get a candle.”

“A lantern would be better,” suggested Laurie, viewing the hole dubiously.

“That’s so, and there’s one here somewhere. I noticed it the other day.” Bob’s voice came from the cellar beyond, and Laurie heard him walking around out there. Then, “I’ve got it!” Bob called. “There’s oil in it, too! Now we’ll have a look!”

Laurie heard the chimney of the lantern squeak as it was forced up and then drop into place again. Then a wan light came toward the closet, and Bob appeared, triumphant and excited. “Wait till I turn it up a bit. There we are! Come on!”

They passed through between the doors, Bob leading, and stooped before the hole in the wall. Bob held the lantern inside, and Laurie peered over his shoulder. “Gee, it’s high,” whispered the latter.

“Yes, and it isn’t a cave at all; it’s a tunnel!” said Bob, in awed tones. “What do you say?”