The Man in the Tree — Damon Knight

A poet, a millionaire, a circus freak. Gene Anderson was all these and much more. An incredible eight-and-a-half-foot giant, he had a power, a gift that enabled him to reach into other worlds and bring back miracles into this one. He saw a magnificence in the universe that nobody had ever seen and brought the light of truth to man where only darkness had been. But like all prophets, hew was feared as much as loved--and hated by one tortured soul who was determined to see him die...