William resents going on a 'boring' holiday to Wales, but while there he is let into a big secret by Gwyn, a local boy. Gwyn has found a seal pup and has it hidden in a cave. He makes William promise never to tell anyone about it, and plans to breed it on a farm. William is determined to let it go free, and 'borrows' a leaky dinghy to take it out to sea. The story ends with an exciting rescue.
- ISBN10 0099991500
- ISBN13 9780099991502
- Publish Date 15 April 1993 (first published 27 March 1980)
- Publish Status Out of Print
- Out of Print 1 February 2014
- Publish Country GB
- Publisher Penguin Random House Children's UK
- Imprint Red Fox
- Format Paperback (B-Format (198x129 mm))
- Pages 128
- Language English