At the Terran base on the conquered planet of the Mnemosyneans, Tyr Yllen is unique. The ultramodern techniques Earth teachers used are of no use with someone like Tyr. As an "Uneducated" he is considered little better than the village idiot. But when Educator Horace Mann arrives all the way from Earth, everything changes. Never in his wildest dreams could Tyr have imagined that Mann's teaching would lead him to battle for the survival of a psychic race of beings and the people who had conquered them...