at length the sight of a clearing ahead warned them to again exercise caution.
They crept along through the trees and underbrush until the clearing came fully into view. It was at that part of the interior of the island where the swamp gave way to the rocks, and the grassy clearing led in a gradual slope to a high wall of rock, at the base of which was the mouth of a cave. As the Hardy boys watched, they could see the four men at the opening. One of the fellows, a tall, dark man, was mopping his brow with a handkerchief, while another, a man with a shock of red hair, was just going into the cavern. The other two had flung themselves down on the rocks in the shadow of some overhanging bushes.
"So that's the cave!" exclaimed Frank.
"I wonder if Chet and Biff are inside."
"Most likely. I wish we could get a little closer."
"Too dangerous. They can see any one coming into the clearing."
This was true. The cave had evidently been chosen not only for its possibilities as a shelter but for its defensive virtues as well. It was plainly the hangout of the gang.
"We'll have our work cut out for us to get in there," muttered Frank. "The place is too much in the open. Our only chance is to wait until some of them go away."
