Woven throughout are reflections on the writer’s craft and on artistic creation. Here, too, are singular memories of Smith’s life in Michigan and the irremediable loss of her husband, Fred Sonic Smith.   Braiding despair with hope and consolation, illustrated with her signature Polaroids, M Train is a meditation on travel, detective shows, literature, and coffee. It is a powerful, deeply moving book by one of the most remarkable multiplatform artists at work today.