"Why not?" asked Sammy.
"Well, that door might suddenly slide shut while we were in there, or there might be a false bottom to the floor, and we'd drop through, or something like that," suggested Bob.
"Huh! You're as bad as you say I am, in thinking up things!" cried Sammy. "I say let's go in. We can put a stick, or something, across the sliding door, so that can't go shut on us."
"Well, maybe that's all right," agreed Bob. "But it sure would be hard luck if we got caught in here. No one would ever know where to find us."
"That's right," admitted Sammy, and, for a second or two, he was almost ready to give up the adventure.
But his desire to see what the strange things were was so strong that he decided, by taking care, it would be all right.
"Oh, come on, fellows," he exclaimed. "Let's take a chance! I'll fix the door."
They found a piece of a broken shutter which they wedged across the sliding doorway so that, even if they, or someone else, accidentally touched the hidden spring which sent the door to and fro, they would not be trapped.
"There, I guess that's all right," cried Sammy. "Now come on in!"
But Bob still hung back, though Sammy stepped across the door sill.