Something is wrong in the deep forests of Broke Tree Valley. Something deadly. Something mammoth. The legends speak of something larger than human comprehension...A monstrous phantom that disappears for decades at a time. Now, it's back, and things are about to go Very Bad if four people—Olivia, Jess, Kokoro, and Mason, scientists who have come to the small city of Kasbro to investigate a bizarre series of seismic activities in this heavily forested valley—can't put the Mammoth to rest. One real problem with this is...Olivia's dead.