Ward's guide in this journey is a contemporary artist whose own life was transformed by the painting, a simple man named Angelo who shows him where it still hangs in a small church in Naples and whose story helps him see its many layers. As Ward unfolds the structure of the painting, he explains each of the seven mercies and its influence on Caravaggio's troubled existence. Caravaggio encountered the whole range of Naples's vertical social layers, from the lowest ranks of poverty to lofty gilded aristocratic circles, and Ward reveals the old city behind today's metropolis. Fusing elements of history, biography, memoir, travelogue, and journalism, his narrative maps the movement from estrangement to grace, as we witness Caravaggio's bruised life gradually redeemed by art.