Allie and Nick both die in a car crash. They 're supposed to go towards that light at the end of the tunnel, but they bump into each other and get knocked into a mysterious world between life and death called Everlost. The world is filled with terror, and unexpected twists for the souls that reside there. Both Nick and Allie want their lives back, so they start exploring this new world, hoping to find a way back to their normal lives. There is a catch, however: If they stand still in the living world for too long, they will sink into Earth. The longer they stay in Everlost, the more they forget about themselves in the real world.
In the beginning of the book, they are saved by a boy named Lief, who tells them that they are called "Afterlights", who cannot walk where the living walk. They are somewhat like ghosts. He warns them of a dreaded and evil monster, McGill, before they make their way to New York City. There, they meet a Mary Hightower, the "mother" of Afterlights who keeps many Afterlights safe, and author of hundreds of books on living in Everlost. She lives with the children under her care in the destroyed World Trade Center. This is because things that are much beloved in the world can cross into Everlost if they are destroyed. They settle down, but Allie is not content with the way things are, so she sets out to see if she has special powers. Allie notices other Afterlights at the Twin Towers keep repeating and doing the same exact thing everyday. Lief gets stuck playing the Pac-Man arcade game non-stop and she has to pry him from the game to drag him along with her. They meet The Haunter in a factory that crossed over to Everlost. Allie gets Lief and Nick captured by The Haunter and it is shown that Allie can pick up living things and also possess or 'skinjack ' as it is called in the book. In her adventures, she learns how to use her own powers. These adventures tell Nick his purpose while revealing