The Man in the Maze.

Science Fiction. "At the dawn of man's galactic journeys, he was Earth's first ambassador to Beta Hydra IV. But something about his brain emanations so repulsed the Hydrans they altered his mind to radiate an aura that would soothe them - and make him anathema to human beings. Embittered, he fled to a distant planet to live out his days in utter isolation in an abandoned city of terrifying labyrinths. Then, Earth launched an expedition to penetrate his maze-like citadel, and convince him to undertake a vital mission - for precisely that thing which made him an outcast, now made him a savior!"