"What do you make of it, Dick?" Dave asked. "Just as much as you fellows do---no more," came the reply. "If it isn't anything that carries danger to us," proposed Darrin, "we may as well go back and to bed." "All who are sleepy enough may go back and turn in," Prescott suggested. "I'll stay up and watch for a while." "So will I," promised Reade. But it turned out that none of the party wanted to sleep. Even Darrin said he was interested enough in this newest mystery to stay up and try to fathom it. "Whatever it is," smiled Dick, "it hasn't done us any harm." "Oh, yes; there has been one casualty, at least," protested Holmes. "The explosion has caused a compound fracture in my bump of curiosity." "There don't seem to be any more explosions," suggested Dick Prescott, after a few moments had passed, and some of the boys were yawning. "Anyone want to turn in?" No one wished to do so, however. "If we can't find out anything to-night," murmured Dick, in a low voice, "we'll at least make a strong effort in that direction after breakfast to-morrow morning." "We have the lake mystery on for after breakfast," urged Hazelton. "There's probably a connection between the lake mystery and the big explosions," whispered Tom Reade wisely. "Fellows, I've a notion that Danny Grin and I unintentionally bumped into someone else's business of some queer kind. Now the people who are peevish with us are trying to chase us out of these woods. At least, that's my idea." "It will take something more than noise to chase us," smiled Dick coolly. "Our ear drums are as sound as the next fellow's. Just the same, I wish we might find out something about this mystery. If there's another explosion like that last one, then some of us ought to travel straight in the direction of the noise." "And run straight into the hard, swift punch that is behind that noise!" muttered Danny Grin, with one of those facial contortions that had earned him his nickname. "Whoever starts to playing with a boy's curiosity must be ready to abide by the consequences," chuckled Prescott. "Now, if anyone has started something against us, then we'll run the rascal to the earth." "You don't suppose it's Dodge's work?" whispered Greg. Before Dick could answer Darrin broke in with an emphatic: "Not much! The lake mystery affair is one of too large calibre for Bert Dodge's poor, anaemic brain. There's something bigger and smarter than a mere Dodge behind the doings of this night." "It's one o'clock, fellows," said Dick, after walking over to the lantern for a glimpse at his watch. "Tom, Greg and I will stay up until three o'clock and be ready to jump out together at the first sign of anything happening. The rest of you turn in and get some sleep. We'll call you at three o'clock and then take our turn at the pillow." "You'll call us, of course, if anything happens?" asked Dave.