One day, under the cover of darkness, three sleeping children were wrapped in blankets and taken away from the house from mortal danger. Since then, Kate, Michael and Emma have changed many orphanages, never ceasing to hope that one day their parents will return for them. But one day the children find themselves in a very strange place. They find themselves the only children in a huge half-abandoned house and find a mysterious study with old books. Touching a strange green book, the children are transported back in time - they have to fight a witch, find out who their parents were, and try to change the future in order to save the inhabitants of the small town at the foot of the waterfall and return home.