The Royal Book of Oz, the fifteenth title in the beloved Oz series and the first penned by Ruth Plumly Thompson, follows the Scarecrow on a whimsical quest to uncover his family history. Believing he has lost his memory, he leaves the Emerald City and tumbles down a magical hole into the Silver Islands, an underground kingdom where citizens mistake him for their long-lost Emperor. Meanwhile, Professor Wogglebug compiles a grand Royal Book of Oz. Filled with humor, adventure, and delightful new characters, this enchanting tale explores identity and belonging while reaffirming that true worth lies not in lineage, but in kindness and friendship.