The Pony Rider Boys in the Grand Canyon; Or, The Mystery of Bright Angel Gulch

A group of young riders undertakes a guided expedition into a vast canyon, exploring rims, craters and remote gulches while camping through sudden snows and storms. Episodes of adventure include perilous river passages, a frightening separation and rescue when companions fall into hidden chasms, encounters with a local native community, confrontations with wild animals, and puzzling incidents such as a missing rifle and trail tracking by their dogs. The narrative alternates outdoor travel scenes, action-filled rescues and clever problem-solving as the boys, assisted by a guide and a professor, piece together clues and resolve the central mystery before returning from the canyon.