Second Foundation

The third Foundation book centers on the Second Foundation, the secret group Hari Seldon is said to have set up to protect his plan. In the first part, the Mule, a mutant conqueror who already rules much of the galaxy, hunts for it. In the second, decades later, fourteen-year-old Arkady Darell and a small circle of conspirators on Terminus try to discover where it is and who belongs to it.