Having survived the events of 2007’s Dust
, the crew of the generation starship Jacob’s Ladder, marooned for centuries, find themselves once more racing though space. Unfortunately, the ship is badly damaged, large sections are out of communication with the central computer, and the highly augmented Exalt who rule the ship and its merely human occupants have lost the knowledge of how to select a destination. Antagonist Arianrhod is still alive, free, and a potential threat. Dealing with these problems involves epic journeys across a massive, poorly mapped spacecraft and confrontations with forgotten and suppressed relics of the past. Bear enhances the usual generation ship themes—social amnesia, decaying infrastructure, and mission-threatening grand calamities—with enough new flourishes, including a biotechnology-based class system and cruel experiments based on misapprehensions of Darwin, to keep readers happily engaged. (Mar.)