After a limited nuclear war that decimated humanity and devastated much of the planet, human population levels are still dropping, and birth-rates are in the toilet. Diablo Keep's fate hinges on its herd of Tyrannobos-fire-breathing, omnivorous, 2-1/2 story tall long-horned cattle rivaling the mighty Eocene "Andrewsarchus" in ferocity and sheer terror-which has been half-destroyed as a result of a catastrophic accident. Will the great keep's planned Tyrannobos drive from Socorro, NM to Diablo Keep, Southern California succeed? The fate of worlds may hinge on the answer .