Yellowstone was not just built on a volcano. It was built on a cage.
When a massive earthquake fractures the caldera, it destroys roads, collapses bridges, and strands wildlife biologist Rourke Fenner deep in the backcountry. The tremors have also cracked open a network of ancient subterranean lava tubes and released a nightmare that has been surviving in the dark for eleven thousand years.
Arctodus simus. The giant short-faced bear.
Trapped in a boiling landscape of toxic steam and crumbling terrain, Rourke must lead a small group of stranded park employees and tourists to safety. They are being hunted by the apex carnivores of the Ice Age. The earth has broken open, and the food chain has just been reset.
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