About five years has passed since the New Law robots were put to work at Purgatory to assist with the terraforming effort for Inferno. Alvar Kresh won the election for governor and ended up choosing a dual terraforming system combining a positronics with a super computer. In an unexpected turn, Kresh ended up marrying Fredda Leving. Initially I thought that they made a rather odd couple, but I think Allen did a good job of handling their relationship throughout this book. The main plot Utopia revolves around a plan by a scientist to harness a comet and blow it apart to dig a huge channel from the southern ocean to the frozen northern ice cap which would otherwise be impossible by conventional means.