d to untangle it, with your
help."

"Delighted," Bennett said. "But you'll find Taylor much more of an
expert than I. See you later, boys, I'm sure."

They watched as the AEC man drove off. "I'm pretty sure we have the
answers," Rick said happily. "Hilleboe probably is the boss, since he
owns the property, but Collins is in on it to some extent because he
knew about the upper mine tunnel, and acted as agent for Hilleboe. And
our pal the Frostola man is in it up to his hip pockets."

"He's the ghost," Scotty agreed. "Both in the tunnel when the machine is
run, and at night when the ghost walks. At least he is part of the time.
Of course there's no reason why someone else couldn't be the ghost, too,
maybe two or three different people."

"Someone else was the ghost the first night," Rick remembered, "because
the Frostola man was watching."

"Good thing we don't have to prove any of this," Scotty concluded. "The
FBI is on the job. They'll get the proof."

"But we're the ones who'll bury the ghost for good," Rick promised.

CHAPTER XX

Death of a Ghost

Dr. Miller planned a large cook-out and picnic party in the mine area,
and he issued invitations to people from the town of Lansdale, to the
staff of Spindrift Island's scientific foundation, to Mr. Bennett of the
AEC, and to a number of folks who preferred for reasons of their own to
remain anonymous for the time being.

The reason, Dr. Miller said, was to get all his friends together for one
big shindig before he and his family returned to Spindrift Island where
a new project was waiting.

Even Jan and Barby knew no other reason than this.

Meanwhile, the boys were busy preparing to "bury the ghost for good."
What made the plan difficult was that it had to be done publicly, and in
such a way that it wouldn't interfere with police activities.

The boys met with Taylor, the FBI agent. He was a good-natured young man
who might have been a lawyer, but under the attractive grin and ready
chuckle, Rick could sense that Taylor could be a very tough man indeed
if need be. The agent listened to their plans and laughed outright.

"I like it," he said. "We must do this, if only for the effect on the
Frostola man when he sees what has happened. It's turning the tables on
that joker, and he deserves it."

Rick sensed more than met the ear in that statement. "You know something
about him?" he asked.

"Quite a bit. He's not exactly Public Enemy Number One, or