After stumbling upon the secret society of ninja librarians who transcend time and space, Dorrie and her brother have officially become apprentices. They are determined to help the Lybrarians find a missing key that could destroy their beloved fortress, Petrarch's Library.
- ISBN10 1402287712
- ISBN13 9781402287718
- Publish Date 15 April 2014 (first published 1 January 2014)
- Publish Status Active
- Imprint Sourcebooks Jabberwocky
- Format eBook
- Pages 384
- Language English