compartment. That this had been done by one of the many keys on
Andy Foger's ring was evident.

"Now what could have been his object?" mused Tom. "I should think
if he wanted to put a hole in the boat he would have done it
amidships, where the water would have a better chance to come in,
or perhaps he wanted to flood it with gasoline and--"

The idea of fire was in Tom's mind, and he did not finish his
half-completed thought.

"That may have been it," he resumed after a hasty examination of
the gasoline tank, to make sure there were no leaks in it. "To
get even with me for outbidding him on the boat, Andy may have
wanted to destroy the ARROW. Well, of all the mean tricks, that's
about the limit! But wait until I see him. I've got evidence
against him," and Tom looked at the key ring. "I could almost
have him arrested for this."

Going outside the boathouse, Tom stood on the edge of the dock and
peered into the darkness. He could hear the faint sound of
someone rowing across the lake, but there was no light.

"He had one of those electric flash lanterns," decided Tom. "If I
hadn't found his keys, I might have thought it was Happy Harry
instead of Andy."

The young inventor went back into the house after carefully
locking the boat compartment and detaching from the engine an
electrical device, without which the motor in the ARROW could not