Thus it was arranged, and Tom and his chum started off, following the winding shore of the lake, casting their eyes over its lonely surface for a sight of the boat they so much needed. It was an anxious search, and it was not rewarded with success. “Well, we may as well go back,” suggested Tom, after a bit. “It will soon be too dark to see, and we want to be together when night comes on.” “That’s right,” assented his companion. “What are we going to do next?” “Search me,” replied Tom laconically. “We’ll have to rough it, I guess; make some sort of a bunk with tree branches. Or we may find a sort of cave to sleep in.” “And what about supper?” asked Bert, suggestively. “We’ll have to take in our belts a few holes, and make our hunger small, as the Indians do.” They turned back, and soon rejoined Dick and Jack, who were moodily sitting on the shore. One look at the faces of Tom and Bert told the story of their unsuccessful search as plainly as words could have done. “Well, what about it?” asked Jack. “What are we going to do, Tom?” “Look for a place to stay over night,” was the prompt answer. “We’ll need shelter, anyhow. Let’s find a good place, and cut some hemlock branches for a lean-to.” “A cave would be just the cheese,” spoke Dick. “Maybe we can find one if we look.” “Then we’ve got to get busy,” declared Bert. “It’ll soon be dark.” Rather at a loss in which direction to start, the boys walked back along the bank of the river. Then, seeing a sort of trail, they followed that. “Where does it lead to?” asked Jack, as he limped along. “I don’t know,” answered Tom. “It’s been traveled, I can see that, and it may lead us to some sort of shelter.” “I wish it would lead us to a restaurant,” murmured Bert. “Hey, cut out that line of talk!” warned Tom. It was now so dark that they could hardly see, but the trail was firm under their feet. It led up the hillside that sloped away from the river, and then, turning, followed the stream. Tom, who was in the lead, as he usually was, came to a sudden stop when they had traversed several hundred feet on the straight path. So unexpectedly did he come to a halt that Dick, who was right behind, collided with him. “What’s the matter?” he asked. “See a snake, Tom?” “No, but I see something better. If that isn’t a cave I’m all kinds of a star-gazer. Look!” They peered through the gathering dusk to where he pointed and beheld a black opening underneath a ledge of rock. “It’s a cave all right!” cried Jack. “Go ahead in it,” urged Bert. “Maybe it’s where that bear hangs out,” suggested Dick. “Nonsense!” exclaimed Tom. “A bear wouldn’t have a cave so near a main-traveled trail. He’d pick out a more secluded place for a summer residence.” “Say, you’re getting mighty polite all of a sudden,” declared Jack. “Go ahead inside then, if you think it’s all right, Tom.” “I didn’t say it was all right, but I’m going to take a chance on it if you fellows will come.”