In this impressively researched and incisive book, Bruce Grierson draws on over three hundred stories of so-called "U-turners," who have risked their livelihoods to answer a sudden wake-up call. We meet people who change political parties and careers, doctors who quit to become poets, men who become women, people who suddenly become revolutionaries for a cause they didn't care about the day before. In chapters that address everything from the neuroscience behind epiphanies to the possibility of "forcing" a U-turn, Grierson brilliantly describes and elucidates this powerful, mysterious phenomenon, and in doing so illuminates all of our continual struggles with life choices and identity.