What reason had anyone in the village to connect the disappearance of the boat, the lost horse, the widow's herring, the cork life jacket, the windowpane, the lost peat moss, the rusty clock spring, or the strange prints in the earth with McCullem's Cave?
Who milked the old lady's cow and left a note for her saying, "Don't worry about Nancy this morning!"
Roy determined to find out. Since there seemed to be a connection of some kind with the cave, he went exploring there. The cave was dark, and he had to crawl on his hands and knees. Trembling as he went farther in, he came upon--of all things--a door. He peered in through the crack, and there—
But why don't you read for yourself and find out the secret of the cave.