Philip Taubman, a senior fellow at Stanford, and William Taubman, a Pulitzer-winning biographer, delve into the life of Robert McNamara, a key player in U.S. military history. They discuss newly uncovered letters from Jacqueline Kennedy that reveal McNamara's personal struggles. Their exploration covers McNamara's evolution from a war advocate to someone questioning the Vietnam War, alongside insights from a private diary. The brothers also reflect on McNamara's duality: his loyalty, ambition, and the haunting guilt from his decisions, painting a portrait of a man deeply at odds with himself.