Mr. Cook was already busy on the next line. It resulted in this word:

ELLSURTH

“Another mountain?” asked Roy.

“Probably means Ellsworth. There is such a peak east of Pine Alcove River. Hi. Clark worked up that way this summer.”

“But they are a long ways apart,” exclaimed the boy. “How far?”

Mr. Cook consulted the large wall map.

“Nearly a hundred miles.”

The boy’s face fell.

“Anyway,” he said, “these mountains have something to do with each other and the Sink Hole. Looks as if it might be between ’em, don’t it?”