Bob watched the old man with keen interest. In less than ten minutes the islands were reached, and the second boat disappeared as the first had done.
“Who can that old chap be?” was Bob’s mental question. “Can he know Casco?”
Five minutes more passed, and then the youth heard a well-known whistle, to which he at once responded.
In a fraction of time Frank was at his side.
“I couldn’t stay any longer,” said the young man. “Where is Casco?”
“On one of those islands.”
“You don’t say! How did he get over?”
“On a boat; and just now another man went over on a second boat.”
“This is Catfish Lake, and they say the islands are haunted.”
“I don’t believe in ghosts,” declared Bob.