Amazon.com (ISBN 0312854730, Hardcover)

A suspenseful example of an emerging subgenre, the homage to Heinlein's young adult fiction, this novel will satisfy readers of all ages. Eighteen-year-old Charlie Newell has inherited a ranch from Uncle Max, who is missing, presumed dead. Hidden behind a pile of old hay in the barn is a tunnel that doesn't lead to the airstrip but to a pristine, uninhabited parallel Texas stocked with extinct megafauna. Charlie recruits four friends to help him exploit the wild side of his ranch, but the project becomes wilder than they expect, and they find themselves in danger not from saber-toothed tigers, but from their fellow Americans.