The three Bone cousins -- Fone Bone, Phoney Bone, and Smiley Bone -- are separated and lost in a vast, uncharted desert. One by one, they find their way into a deep, forested valley filled with wonderful and terrifying creatures. Eventually, the cousins are reunited at a farmstead run by tough Gran'ma Ben and her spirited granddaughter. But little do the Bones know, there are dark forces conspiring against them, and their adventures are only just beginning!