A pack which includes a book of secret codes with a free invisible pen and developer to help you become the mastermind behind a whole network of secret agents. Leave your friends guessing as you find out why pig pens make great homes for messages; talk nonsense with numbers; see the light, send morse code with a torch, pass on some hot gossip without burning your fingers. Create your own crafty codes, send secret signals and learn how to write letters that mean more than they seem to.
- ISBN10 0590199935
- ISBN13 9780590199933
- Publish Date 15 January 1999
- Publish Status Out of Print
- Out of Print 19 January 2010
- Publish Country GB
- Publisher Scholastic
- Imprint Scholastic Hippo
- Format Paperback
- Pages 32
- Language English