While on an archaeological expedition to Balthor, a young astrophysicist stumbles upon the Lumpies, gray smiling creatures with a strange secret.
- ISBN10 0140321667
- ISBN13 9780140321661
- Publish Date 25 September 1986 (first published 26 March 1979)
- Publish Status Out of Print
- Out of Print 7 August 2002
- Publish Country GB
- Imprint Puffin Books
- Edition New edition
- Format Paperback
- Pages 160
- Language English