Bob Johansson did not believe in a hereafter, therefore coming up after being murdered in a vehicle accident came as a surprise to him. To make matters even crazier, he is now a self-aware computer in command of a Von Neumann probe.
Bob and his duplicates have been searching for habitable planets for the past 40 years. But, that is the only aspect of the plan that remains intact. A system-wide war has killed 99.9% of the human race; nuclear winter is slowly rendering the Earth uninhabitable; a radical group wants to finish the job on the survivors; the Brazilian space probes are still out there, still trying to blow up the competition; and the Bobs have discovered a spacefaring species that sees all other life as food.
Robert departed Earth hoping for a life of adventure and blissful seclusion. Instead, he's become a sky god to a primitive native species, humanity's only hope for a new home, and maybe the only thing that can save every living thing in the local sphere from being eaten.