In 1918, the world seems on the verge of apocalypse. Americans roam the streets in gauze masks to ward off the deadly Spanish influenza, and the government ships young men to the front lines of a brutal war, creating an atmosphere of fear and confusion. Sixteen-year-old Mary Shelley Black watches as desperate mourners flock to s ances and spirit photographers for comfort, but she herself has never believed in ghosts. At her bleakest moment, however,...