The Radio Boys on the Mexican Border The Radio Boys on Secret Service Duty The Radio Boys with the Revenue Guards The Radio Boys' Search for the Inca's Treasure The Radio Boys Rescue the Lost Alaska Expedition. This is a wonderful land, fellows, full of legend and story, vast mountains, vast rivers, vast jungles, unexplored territory and unconquered tribes. It was Jack Hampton speaking, and he leaned on the rail of a coastwise steamer, as she came to anchor in the open roadstead of Valparaiso. I wonder what lies ahead, said Frank Merrick, leaning beside him. We ought to get some adventure out of this, besides mere civilized travel.