"The mainland. If we can get to Rock Harbor we'll get help."
"How about Chet and Biff?" asked Joe soberly.
"We can't afford to take a chance on bringing them off the island just now. I hate to desert them, but we can't do anything else. If we went back for them we'd likely undo everything we've done so far. But I think they'll be safe enough. They'll hide in the bushes. Those fellows have been so busy chasing us that they haven't had any time to worry about them."
"Perhaps they think we all got away."
"If they do they won't be hunting around for Chet and Biff. In any case, we had the agreement that even if only one of us got away he would come back with help for the rest. They'll know we'll be back."
"So will the gangsters. I'll bet they're worrying about how they can clear away from this island before we get back."
Frank headed the boat for the mainland. It was his intention, as he had said, to make his way to Rock Harbor, where they could secure help—officers and men to come back with them to Blacksnake Island to aid in the rescue of their chums and in the capture of the gangsters.
There was the chance, of course, that the
