When Meg casts a spell to make a lunch box for Mog, the box contains a caterpillar which eventually turns into a butterfly.
- ISBN10 0434956589
- ISBN13 9780434956586
- Publish Date 9 March 1992 (first published 3 October 1988)
- Publish Status Out of Print
- Out of Print 23 October 2000
- Publish Country GB
- Publisher Egmont UK Ltd
- Imprint Heinemann Young Books
- Format Hardcover
- Pages 32
- Language English