Yee-Haw!! The Pony Rider Boys are on the move again! This time the boys are in the Ozark Mountains in Missouri. With Joe Hawk, or Eagle-eye, guiding them, Professor Zepplin and the Pony Rider Boys are sure to find many adventures in this action-packed, fourth book of this series by Frank Gee Patchin. (Summary by Ann Boulais) Previous book in the series: The Pony Rider Boys in Montana Next book in the series: The Pony Rider Boys in the Alkali