Four children set out to rescue a sorceress held captive in a parallel world.
- ISBN10 035616800X
- ISBN13 9780356168005
- Publish Date 8 June 1989 (first published October 1987)
- Publish Status Out of Print
- Out of Print 10 March 1994
- Publish Country GB
- Publisher Prentice Hall (a Pearson Education company)
- Imprint Prentice Hall & IBD
- Format Hardcover
- Pages 208
- Language English