9780765345004. Pre-Owned: Good condition. Mass-market paperback. Language: English. Pages: 448. Mass market (rack) paperback. Glued binding. 448 p. Neanderthal Parallax 1. Intended for a young adult/teenage audience. The first volume in this new science fiction trilogy examines the humans of this universe and the Neanderthals of a parallel world where they are the dominant intelligence. When a Neanderthal physicist pierces the barrier between the two worlds and finds himself in this universe he is quarantined and studied while in his own world his lab partner is investigated for his murder.