Get hooked on the New York Times and USA Today bestselling series that's taking the world by storm! In Keeper of the Lost Cities, an ordinary girl named Sophie Foster learns she's really an elf from the Lost Cities. Leaving the human world behind, she embarks on an incredible journey to find where she truly belongs — discovering new abilities, making new friends, and above all, realizing the extraordinary person she was always meant to be. But the secrets of Sophie's past were buried for a reason and the truth she uncovers could put all of the worlds in danger.