The story toggles between the past, as Flynn Carsen tries to find Aladdin’s Lamp before an ancient criminal organization known as the Forty Seals gets hold of it, and the future, when Eve Baird and a new group of Librarians — protectors of ancient artifacts like King Arthur’s sword Excalibur — stumble on a mystery in Las Vegas that seems to relate to the Lamp and the powerful djinn it can summon.