Percival Pondercup, a talking teacup who only speaks in riddles, brings amusement and confusion to the Widdershins family. His riddles lead to the discovery of his true nature as a treasure chest, hiding small objects like Mrs. Widdershins’s spectacles and Timothy’s toy dinosaur, Rexy. The family embraces the delightful mystery, hosting “Riddle Tea Tuesdays” for neighbors.