They turned just in time to see him wave his hands desperately and then sink from sight!
CHAPTER II
IN A BAD FIX
For a moment Frank and Sammy were in a panic. Their hearts seemed to stop beating and they looked at each other in dismay.
"What's the matter with Bob?" shouted Sammy, wildly.
"Perhaps he's only fooling us," yelled back Frank, clutching at a shred of hope.
"No, he isn't!" cried Sammy. "Oh, Frank, let's hurry."
They turned and swam with all their might to the place where their comrade had disappeared.
And while they are trying desperately to rescue Bob, I am going to tell those readers who have not read the earlier books in this series just who the boys were and what fun and adventures they had had together up to the present time.
The boys had all been born and brought up in the town of Fairview, a pleasant little place situated on the edge of a large body of water called Rainbow Lake. There were a number of islands in the lake, the largest being called Pine Island. With such a fine body of water close at hand, the boys had great sport both in Summer and in Winter.