In book 11a, follows Peter and Jane as they discover a missing boy on an island and introduces 129 new words. Once this book is completed, the child moves on to book 11b.
- ISBN10 1844223736
- ISBN13 9781844223732
- Publish Date 6 May 2004
- Publish Status Out of Print
- Out of Print 21 July 2009
- Publish Country GB
- Publisher Penguin Random House Children's UK
- Imprint Ladybird Books Ltd
- Format Hardcover
- Pages 56
- Language English