The boys sped across the clearing and went on down the trail through the dark wood beyond. They were drawing closer to a brook now and they could plainly hear the lapping of the water against the rocks in the distance. In this vicinity there were several brooks flowing down into Barmet Bay.
Frank suddenly came to a stop.
"Look!" he said.
The boys peered through the gloom.
Beyond the branches of the trees they saw a glimmer of light. It disappeared, then shone again, steadily.
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.