A family finds themselves ensnared in a nightmare as they are hunted by a malevolent, mythical creature. For centuries and across cultures, parents have warned their children of the legendary Bagman, who snatches innocent children and stuffs them into his vile, rotting bag—never to be seen again. Patrick McKee (Sam Claflin) narrowly escaped such an encounter as a boy, which left him with lasting scars throughout his adulthood. Now, Patrick's childhood tormentor has returned, threatening the safety of his wife Karina (Antonia Thomas) and son Jake (Caréll Vincent Rhoden).