When the goblins steal Ida's baby sister to be their bride, Ida goes in search of her, climbing backwards through the window into outside over there. How Ida rescues her sister with the help of her magic horn and the guidance of her beloved papa, makes for an endearing, enchanting tale. Sendak's unforgettable, lyrical tale of sibling rivalry and the conclusion to what he considered a thematic trilogy that began with Where the Wild Things Are and In the Night Kitchen. A 1981 Caldecott Honor Book.