Buzz Bissinger's twins were born three minutes—and a world—apart. Gerry, the older one, is a graduate student at Penn, preparing to become a teacher. His brother Zach is a savant, challenged by serious intellectual deficits but also blessed with rare talents: an astonishing memory, a dazzling knack for navigation, and a reflexive honesty that can make him both socially awkward and surprisingly wise. As Buzz and Zach journey from Philadelphia to Los Angeles, they see the best and worst of America and each other. Ultimately, Buzz gains a new and uplifting wisdom, realizing that Zach's worldview has a sturdy logic of its own: a logic that deserves the greatest respect.