Harry and Doug investigate when special bookmarks begin to disappear while their class is busy studying poetry and running their own post office.
- ISBN10 1101136324
- ISBN13 9781101136324
- Publish Date 3 September 2009 (first published 4 September 2008)
- Publish Status Active
- Imprint Puffin Books
- Format eBook
- Pages 80
- Language English