In each of six essays, Marshall reinvents the personal essay form, as a portal to the past and its lessons for living into the future. The book’s brilliant, assured interplay between memoir and biography places surprising characters on the page, including the twelfth-century Buddhist hermit Kamo no Chomei, a reassuring spiritual presence for Marshall during several otherwise deracinating months in Kyoto. In her stunning coming-of-age tale, “Free for a While,” set in 1970s California,...