Among Fulton J. Sheen’s thousands of converts were celebrities such as Clare Booth Luce and Henry Ford II, and former communists Louis Budenz and Elizabeth Bentley. Reeves discusses these conversions and Sheen’s close friendship with J. Edgar Hoover, and details for the first time the struggle between Sheen and his chief rival, Francis Cardinal Spellman, a battle of ecclesiastical titans that led all the way to the Pope and to Sheen’s final humiliation and exile.