Fourteen-year-old Riko manages to get her sister Sif and herself to their Pacific island home, where a scientist who falls in love with Sif discovers her connection with an underwater race.
- ISBN10 0140384758
- ISBN13 9780140384758
- Publish Date 24 April 1997 (first published 26 March 1987)
- Publish Status Out of Print
- Out of Print 22 October 2004
- Publish Country GB
- Imprint Puffin Books
- Format Paperback
- Pages 180
- Language English