1919. Henry has moved to the countryside with her parents and her baby sister, Piglet – all still scarred by the death of her brother. Alone in her head, she begins to explore her surroundings, encouraged by her only friends – characters from her favourite books. Nobody much notices when she wanders into the woods at the bottom of the garden and meets Moth, a striking witch-like woman. Together they form a bond that could help Henry save her family.