Tris and Winola find the underrunners, a vast network of tunnels, the ideal place to escape their unhappy lives and act out their fantasies, but the tunnels become a dangerous place when invaded by an unseen stranger.
- ISBN10 0140368698
- ISBN13 9780140368697
- Publish Date 1 August 1994 (first published 30 April 1992)
- Publish Status Active
- Imprint Puffin Books
- Format Paperback (US Mass Market)
- Pages 176
- Language English