Richard Brookhiser wrote his first cover story for National Review at age fourteen, and became the magazine's youngest senior editor at twenty-three. William F. Buckley Jr. was Brookhiser's mentor, hero, and admirer; within a year of Brookhiser's arrival at the magazine, Buckley tapped him as his successor as editor-in-chief. But without warning, the relation ship soured — one day, Brookhiser returned to his desk to find a letter from Buckley...