Chapter 20 THE GROUPER BANKS.

"We are grateful for what you did in our behalf," said Charley, when they again came upon the Roberts on the dock. "We did not expect you to take up our troubles but we cannot find words to express our gratitude for what you have done for us."

Big Bill blushed like a school girl. "We didn't do much," he said, awkwardly. "I was going to do it any