Six years after the violent death of her husband, Amelia (Essie Davis) is at a loss. She struggles to discipline her ‘out of control’ 6-year-old, Samuel (Noah Wiseman), a son she finds impossible to love. Samuel’s dreams are plagued by a monster he believes is coming to kill them both. When a disturbing storybook called ‘The Babadook’ turns up at their house, Samuel is convinced that the Babadook is the creature he’s been dreaming about. His hallucinations spiral out of control; he becomes more unpredictable and violent. Amelia, genuinely frightened by her son’s behavior, is forced to medicate him. But when Amelia begins to see glimpses of a sinister presence all around her, it slowly dawns on her that the thing Samuel has been warning her about may be real.