"Hold on there!" cried the young inventor. "Who are you? What do
you want? Come back here!"

The person in the 'coat returned no answer. With his heart doing
beats over-time Tom lighted a lantern and made a hasty examination
of the ARROW. It did not appear to have been harmed, but a glance
showed that the door of the gasoline compartment had been unlocked
and was open. Tom jumped down into his craft.

"Some one has been at that compartment again!" he murmured. "I
wonder if it was the same man who acted so suspiciously at the
auction? What can his object be, anyhow?"

The next moment he uttered an exclamation of startled surprise and
picked up something from the bottom of the boat. It was a bunch
of keys, with a tag attached, bearing the owner's name.

"Andy Foger!" murmured Tom. "So this is, how he was trying to get
even! Maybe he started to put a hole in the tank or in my boat."


CHAPTER VI

TOWING SOME GIRLS

With a sense of anger mingled with an apprehension lest some harm
should have been done to his craft, the owner of the ARROW went
carefully over it. He could find nothing wrong. The engine was
all right and all that appeared to have been accomplished by the
unbidden visitor was the opening of the locked forward