CHAPTER X

The Great Discovery “I’ll bet that light’s a signal light,” whispered Joe Hardy to his brother. The boys watched the yellow gleam among the trees. Then, slowly, the light began to move. It swung to and fro, as though it was being carried by some one, and finally vanished. Frank led the way down the path. In a few minutes they heard a snapping of twigs that indicated that the two men were not far ahead. The path dipped sharply, down a rocky slope, sparsely covered with underbrush. Then the brook came into view. They…