San Diego, 1918. The First World War and the killer flu, the Spanish Flu, are harvesting the dead. The world is on the verge of an apocalypse. People walk the streets wearing masks, and the government sends men to the front. An atmosphere of fear and confusion reigns. Sixteen-year-old Mary Shelley Black sees bereaved people trying to find solace in séances. The girl does not believe in ghosts, trusting scientific facts. Everything changes when a loved one killed in the war returns to Mary... as a spirit. An ethereal echo of the man whom the girl loved. What does he want from her? What's going on in this city? Do ghosts really exist? Mary must understand why her beloved returned from the other world and what fate his mysterious and creepy appearance promises her...