Purgatory is a storage unit in rural Alabama for Ed and Lorraine, the gunshot-ridden corpses of a murdered married couple. Leah and Todd, their teenaged murderers, flee the state to Arkansas, haunted by memories and the unearthly talking dead. When Mara and Ethan, two recent transplants from New York City, take the young adults into their new home, the disturbing unfolding reality of the situation threatens to destroy the lives (and afterlives) of all involved.