Rock Jaw Master of the Eastern Border (Bone, Book 5)

The fifth book in the Bone series. It collects issues 28-32 of Jeff Smith's brilliant self-published Bone comic book series. This book focuses on the journey of Fone Bone and Smiley Bone. They travel to the mountains to return a baby Rat Creature back to his own kind. On the way, they are interrupted by Roque Ja (whose name the Bones mispronounce as "Rock Jaw"), a giant and enigmatic mountain lion.