In an extraordinary day at the beach, after winning a sand castle contest, two sets of twins resolve the mystery of the disappearance of a rich woman's dog.
- ISBN10 0140326545
- ISBN13 9780140326543
- Publish Date 27 September 1990
- Publish Status Out of Print
- Out of Print 26 October 2004
- Publish Country GB
- Imprint Puffin Books
- Format Paperback
- Pages 64
- Language English