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Isaac Asimov's Inferno is the middle book of Roger MacBride Allen's Caliban trilogy, the authorized Asimov-universe continuation novels written in the early 90s. The conceit is wonderful: the planet Inferno is being slowly terraformed and is being shaken by a new political movement that wants to abandon the Three Laws of Robotics as a cultural foundation. The robot Caliban, designed without the Three Laws as an experiment, has the unique position of being both threat and witness.
Allen takes the Asimov setup seriously enough to do philosophy with it. The book is more interested in what the Three Laws actually mean for individual robotic and human moral life than the original trilogy ever was. Inspector Alvar Kresh, the human detective at the center, is one of the best protagonists in the entire authorized Foundation/Robots extended universe.
Four stars. Allen's Caliban books are some of the few licensed Asimov novels worth reading, and Inferno is the strongest of the three. Read after Caliban, the first in the trilogy.
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