In the final installment of the Almost Human series, Dr. Ken Turner and his colleagues are confronted with the news of a mysterious massacre of several families and the disappearance of three young girls in the forest of the Pacific Northwest. Is this related to the hybrid creatures they discovered in the jungles of Africa, that were kidnapped by shady government agents, and the disappearance of their colleague Dr. Melon? They find themselves back on the trail in pursuit of the half-human, half-chimpanzee creatures. Their quest begins in the little town of Willow Creek where they continue their search through the surrounding Trinity Forest where the mythical Bigfoot is said to roam. At the risk of their careers and reputations, who or what will they find?