After a botched Halloween ritual, Madison Spencer, the liveliest and snarkiest dead girl in the universe, finds herself trapped in Purgatory, otherwise known as Earth. She's invisible to everyone who's still alive, yet she can still see and hear every detail of our world. The upside: she no longer subject to physical limitations (she can pass through doors and walls). The downside: well, she's still dead. Her first stop is her parents' luxurious apartment, where she encounters the ghost of her long-deceased grandmother. For Madison, the encounter triggers memories of the awful summer she spent upstate with Nana Minnie and her grandfather, Papadaddy. As she revisits the painful truth of what transpired over those months, her saga of eternal damnation takes on a new and sinister meaning. It turns out, Madison and her narcissistic celebrity parents have always been key elements of Satan's master plan--doomsday. That is, of course, our plucky herione can foil him.