De Quincey, Baudelaire, Poe, Joyce, Benjamin, Melville, Lorca, Whitman . . . walkers and city dwellers all, collagists and chroniclers. In To Walk Alone in the Crowd, Antonio Muñoz Molina emulates these classical inspirations, following their peregrinations as well as telling their stories, in a book that is part memoir, part novel, part chronicle of urban wandering.