Millennia of conflict between humans and mechs have driven the human race to near-extinction. Now, as the fierce AI mechs begin their final assault on mankind, it soon becomes apparent that three men--three generations in a family of voyagers--are their targets. Toby Bishop, his father, Killeen Bishop, and his grandfather, Nigel Walmsley, each carry a piece of the lethal secret that can destroy their enemies. But hunted through space and time by relentless assassins, they have no idea that they possess the only weapon that can save humanity.