When Henry finds a key on the sidewalk and gives it to its owner, he follows her into a huge bookstore. Griselda Snook's Spectacular Books, which features a vast array of Halloween-themed books and caters especially to Halloween characters, has books for every interest. Despite the variety in choices, Henry isn't convinced that he'll find anything for himself. Could a guest reader at the store, Magenta Screech, have the perfect book for Henry?