"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