Two children find the hidden door to fairyland with the help of the world’s smallest troll. Struggling to accept a new step mother in their lives, Sally and Liam run away from home and find themselves thrown into the adventure of a lifetime, where they befriend Raglin, the last and smallest of the woodland trolls. Helping Raglin find his way home to the land of the fairies after two thousand years of exile is no easy task. Along the way, Sally and Liam must help him overcome his arch enemy, the Black Witch (Jenny Agutter), free the Fairy Princess and come to terms with a new mother (Patsy Kensit).