To test his theories of immortality and life after death, Dr. Peter Hobson has created three electronic simulations of his own personality. The first has all knowledge of physical existence edited out, to simulate life after death. The second is without knowledge of aging or death, to simulate immortality. The third is unmodified, a control. Now they are free. One is a killer.

From Publishers WeeklyCanadian writer Sawyer brings his Neanderthal Parallax trilogy to a close, leaving some loose ends that beg for a follow-up further exploring the interaction of two parallel worlds: the overcrowded and polluted one we're used to and another inhabited by highly intelligent and civilized Neanderthals. In the earlier books (Hominids and Humans), physicist Ponter Boddit got translated from the Neanderthal world to ours, where he fell in love with geneticist Mary Vaughn. The couple joined with people of good will from both worlds to keep the link open. Now, though, it's time to consider the implications of such a continuing connection. If people have trouble getting along because of such distinctions as sex and race, how will they be able to co-exist with members of another species? Some individuals see anyone different as a rival, a threat that must be destroyed. Others coldly calculate how to seize new territory for "humanity." Sawyer's characters are less interesting for who they are than for what they are-or what they represent. Still, his picture of the unspoiled Neanderthal world is charming, and he raises some provocative questions. If, for example, only Earth-humans have brains capable of religious belief, should Ponter and Mary genetically design their child with that ability or not? It all amounts to some of the most outrageous, stimulating speculation since Robert A. Heinlein's Stranger in a Strange Land questioned our tired, timid conventions.Copyright 2003 Reed Business Information, Inc. From BooklistIn the conclusion of the Neanderthal Parallax trilogy (_Hominids_, 2002, and Humans [BKL Ja 1 & 15 03] precede it), scientists and lovers Mary Vaughan, who is human, and Ponter Boddit, who is Neanderthal, embark on the harrowing adventure of conceiving a child together. To overcome the genetic barbed wire of mismatched chromosomes, they must use banned technology obtainable only from a Neanderthal scientist living in the northern wilderness, alone but not isolated, for Neanderthals prefer a nonprivate society in which injured persons are quickly rescued, theft is unknown, and personal violence is contained, thanks to permanently implanted personal monitors--a society whose benefits Sawyer persuasively describes. The Neanderthals' electronic surveillance is compatible with their basic peacefulness, however, and can't begin to cope with human craftiness or the malevolent racism of one of Mary's colleagues, who considers Ponter's world as a plum ripe for picking. If his ambitions constitute one alarming threat to a society, the imminent collapse of Earth's magnetic field constitutes another, for it is feared that this will wreak havoc with human consciousness. In an excellent closing twist, a New Year's celebration is disrupted in a very alarming, uniquely human manner as a few Neanderthals watch dumbfounded. A fine combination of love story, social commentary, and ecothriller closes a terrific series with a bang. Roberta JohnsonCopyright © American Library Association. All rights reserved

Amazon.com ReviewThe Terminal Experiment has propelled Robert J. Sawyer into the limelight as one of science fiction's hot new writers, earning him the prestigious Nebula Award in the process. In this fast-paced thriller, Dr. Peter Hobson's investigations into death and afterlife lead him to create three separate electronic versions of himself: one has no memory of physical existence and represents life after death; one has no knowledge of death or aging and represents immortality; and the third is left unaltered as a control. But all three have escaped into the worldwide matrix...and one of them is a killer.

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From Publishers WeeklyIn this polished anthropological SF yarn, the first of a trilogy from Nebula Award winner Sawyer (The Terminal Experiment), Neanderthals have developed a radically different civilization on a parallel Earth, as both sides discover when a Neanderthal physicist, Ponter Boddit, accidentally passes from his universe into a Canadian underground research facility. Fortunately, a team of human scientists, including expert paleoanthropologist Mary Vaughan, promptly identifies and warmly receives Ponter. Solving the language problem and much else is a mini-computer called a Companion implanted in the brain of every Neanderthal. A computerized guardian spirit, however, doesn't eliminate cross-cultural confusion permanent male-female sexuality, rape and overpopulation are all alien to Ponter nor can it help his housemate and fellow scientist back in his world, Adikor Huld, when the authorities charge Adikor with his murder. Ponter's daughter Jasmel believes in Adikor's innocence, but to prevent a horrendous miscarriage of justice (Adikor could be sterilized), she must try to reopen the portal and bring her father home. The author's usual high intelligence and occasionally daunting erudition are on prominent display, particularly in the depiction of Neanderthal society. Some plot points border on the simplistic, such as Mary's recovering from a rape thanks to Ponter's sensitivity, but these are minor flaws in a novel that appeals to both the intellect and the heart.Copyright 2002 Cahners Business Information, Inc. From BooklistPonter Boddit, a physicist in a world in which Neanderthals are the dominant primates, is performing a quantum computing experiment in a Canadian mine, where cosmic rays won't disturb the test's delicate parameters. Suddenly, he is transferred into a heavy water tank in the same mine, but in the universe in which humans predominate. Human scientists are alarmed, then amazed by the spluttering Neanderthal in modern clothing with a curious AI implant in his wrist. Ponter's scientific partner, Adikor, is equally shocked, but what's more, he now faces an inquiry into his best friend's disappearance and suspected murder. Ponter is a most winning creation--thoughtful, brave, and charming as, facing the loss of everything he loves, he befriends a wounded female scientist in the strange human world. The smaller-scale, peaceful, environmentally savvy world of Ponter's people is equally well realized, though Sawyer loses a little steam trying to pin humanity's woes on organized religion. An engaging, thought-provoking story to read after either The Clan of the Cave Bear or Greg Bear's_ Darwin's Radio_ (1999). Roberta JohnsonCopyright © American Library Association. All rights reserved

Science Fiction/Mystery/Crime. 23028 words long. First published in Down These Dark Spaceways, ed. Mike Resnick, Science Fiction Book Club, May 2005 Nebula Award(R) Nominee, Hugo Award Nominee