The Invisible Library by Genevieve Cogman is a fantasy adventure set across parallel worlds, where an organisation known as the Invisible Library collects and preserves rare books to maintain balance between order and chaos. Librarian Irene is sent on a mission to an alternate London to retrieve a powerful book, accompanied by her apprentice Kai, whose mysterious abilities make him both valuable and dangerous. But they are not alone in their search—an enemy named Alberich is also after the book for his own dark goals. As magic, espionage, and danger collide, Irene must race to complete her mission before reality itself is threatened