"For nearly three hundred years, the cryptic journal of Mary Dundas has kept its secrets. Now amateur codebreaker Sara Thomas travels to Paris to crack the cipher"--Page 4 of cover.
- ISBN10 0606368930
- ISBN13 9780606368933
- Publish Date 2 June 2015 (first published 1 January 2015)
- Publish Status Out of Print
- Out of Print 6 April 2021
- Imprint Turtleback Books
- Edition Bound for Schools & Libraries ed.
- Format Hardcover (Library Binding)
- Pages 518
- Language English