?Jack and his younger sister, Annie, visit the tree house on a rainy afternoon, taking along the gold medallion marked with an M and several bookmarks they have collected on previous expeditions.Once inside the tree house, they reminisce about the things they've seen at the places they've visited: dinosaurs, a knight in armor and an Egyptian mummy.Instantly a real parrot appears in the tree outside of the tree house, and the children are transported to a tropical beach.Annie spots a book opened to a picture of a parrot on a beach and wishes to travel there.