Casey Bell (Odette Yustman) hated her mother for leaving her as a child. But when inexplicable things start to happen, Casey begins to understand why she left. Plagued by merciless dreams and a tortured ghost that haunts her waking hours, she must turn to the only spiritual advisor, Sendak (Gary Oldman), who can make it stop.

With Sendak's help, Casey uncovers the source of a family curse dating back to Nazi Germany - a creature with the ability to inhabit anyone or anything that is getting stronger with each possession. With the curse unleashed, her only chance at survival is to shut a doorway from beyond our world that has been pried open by someone who was never born.