Sawyer has made a bold, and generally successful, attempt to raise the genre of speculative fiction above the 'space opera' level. Merging a wealth of science and technical publications with a philosophical drama, he's launched a fresh approach to sf prose.
The story relates the life of Peter Hobson, who becomes a specialist in brain signal detection after witnessing a corpse reacting to an organ transplant operation. His research discloses that the brain indeed possesses something that seems to transcend death. Pursuing that issue, he records his own brain signals, creating three identities. Meanwhile, Hobson's a lovely, devoted, wife betrays him with a creep, devastating him. The result is mysterious deaths, a world reaction to his discovery and some heavy discussion on human values.
The debate over human consciousness, whether it exists, whether it's unique in the animal kingdom and whether it has a long term essence, remains ongoing and intense. Works on evolution and sociobiology are permeated with the question of whether our ability to communicate ideas reflects the existence of a spiritual element in humanity. Ever since early humans could perceive the idea of death the question of 'what happens after' has dominated our thinking. Sawyer makes a good effort to deal with the first part of the question: yes, there's something there, and it's not limited to humans. As to the afterlife, Sawyer raises the question, then leaves it for a later book or someone else to decide.
The many comments below about Sawyer's characters reflect the maturity of his prose style. Readers looking for simplistic people and predictable action are not pandered to in this book. He introduces a devout Muslim AI engineer, surely a novel idea in speculative fiction, and a graduate chemist unable to shed her childhood disappointments. Current concepts of family stress, with separations, sex, and parental tensions all become major features in this story. While the characters here are mildly wooden [especially in comparison with Sawyer's later books], their models are real enough. Sawyer simply had too much philosophy and technology to present in too few pages. The lady copper, in particular, is a pretty fast thinker, given the novelty of the circumstances.
The philosophy redeems any faults in this book. We need to recognize where evolution has brought us. Sawyer touches that issue lightly, bringing the story to a level rarely encountered. We are left uncertain as to whether the concept of the soul is meaningful. That will leave some readers unsatisfied, but that's a major part of Sawyer's appeal. He will raise the questions, you must come up with some of the answer. [stephen a. haines - Ottawa, Canada]