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Frank Hardy swung the flashlight, and the wolf before them sprang back, snarling ferociously, into the darkness. The pattering of feet at the back of the huge cavern became more insistent. The boys were conscious of those greenish eyes all about them. The wolves were circling around the cave.
Another wolf joined the animal that barred the entrance. By some animal cunning, they seemed to realize that by so doing they could entrap their prey. The Hardy boys knew that they had wandered into a veritable den of timber wolves who had found in this abandoned mine an ideal refuge and shelter, who had probably made the place their own for years.