"Dream, is it?" repeated Tommy scornfully. "You just listen to the
sound that comes from behind this cribbing, and tell me what you make
of it!"

Both boys listened intently for a moment, and then Sandy switched on
his light and moved swiftly along the cribbing as if in search of an
opening. Tommy gazed at him in astonishment.

"You've gone and done it now!" he said.

"There's some one in here all right!" Sandy explained. "Did you hear
the call of the pack a minute ago? There are Boy Scouts in there, and
what we hear are the signals of the Wolf Patrol."

"That's right!" cried Tommy excitedly. "That's right!"





CHAPTER III

WHO CUT THE STRING


"Do you suppose he would understand the call of the Beaver Patrol?"
asked Sandy. "I'm going to try him, anyway!"

The boy brought his hands together in imitation of the slap of a
beaver's tail on the water, and listened for some reply.