When journalist Philip Caputo set out to profile William Styron in 1985, it was something of a dream assignment: Styron, then at work on the novel The Way of the Warrior, was one of the towering figures in American letters. The two men’s shared experience as Marines—Styron himself praised Caputo’s 1977 Vietnam memoir, A Rumor of War—formed a connection far stronger than their common bond as writers. But when Styron fell into a clinical depression during the reporting of the story, the nature of Caputo’s profile changed radically. Styron never completed the novel, although his 1990 meditation on depression, Darkness Visible, remains one of the most lucid and illuminating accounts of the illness. Caputo joins host David Brancaccio to discuss Styron’s greatness as a writer and how his struggle against depression—and his ability to articulate it in print—stands, in some regards, as his ultimate literary achievement.