2016 - Sword in the Stacks [Ninja Librarians, Bk 2] (Hardcover) → Paperback ISBN-13: 9781402287732 ISBN-10: 1402287739 Genre: Children's Books ? 2014 - The Ninja Librarians (Hardcover) → Paperback ISBN-13: 9781402287701 ISBN-10: 1402287704 Genres: Children's Books, Politics & Social Sciences 1 |