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 1520003692
- ISBN13 9781520003696
- Publish Date 1 June 2016 (first published 1 January 2014)
- Publish Status Unknown
- Publish Country US
- Imprint Dreamscape Media
- Format Audiobook (CD)
- Duration 9 hours and 19 minutes
- Language English