The bell above the bookstore door rang with a tired little chime, the kind that had heard too many winters. Charlie looked up from behind the counter, one hand resting on a stack of leather-bound volumes that most customers never noticed. To them, Nostalgia was just another rinky-dink, brick and mortar wedged between buildings. To Charlie, it was a hinge in the world—one of many, and one of the last still standing.