PREVIOUS BOOK IN SERIES: THE CAT WHO SAVED BOOKS, ISBN 9780063095724. Books are disappearing from Naomi's school library, and that's when Tiger, the talking tabby cat who saves books, comes to the rescue. Are Nanami and Tiger prepared to face the dangerous challenges that lie ahead? Why are faceless gray soldiers burning books in a stone castle? And what happened to Rintaro, the hero who helped Tiger save books in a second-hand bookshop?