After being run out of Boneville, the Bone cousins become separated and lost in a desert. Later, they arrive in a forested valley filled with wonderful and terrifying creatures.
Phoney Bone rigs the Spring Fair's annual Great Cow Race by putting Smiley in a bovine disguise and convincing everyone to bet their livestock on the Mystery Cow.
Fone Bone and Smiley return a lost rat creature cub to the mountains and discover Rock Jaw, a giant mountain lion whose big ambitions bring him face-to-face with monstrous competition.
Fone Bone, Phoney Bone, and Smiley Bone are run out of their home, Boneville, and become separated in the wilds, but better fortune begins when Fone meets a young girl named Thorn.
