David, Xander, Dad, and Keal have discovered a terrible secret. Now, finding Mom is only a small part of their mission. The consequences of Taksidian's meddling reach far beyond the family-to the future of the world itself. The Kings know their survival depends on finding his weakness in time. Most startling of all is their ability to change the path of history. But will their tinkering in time reunite the family and save the future. or set mankind on an irreversible course of destruction? Recommended for ages 12-15. Slightly Imperfect.