Underrunners /
Margaret Mahy.
- New York, N.Y., U.S.A. : Viking, 1992.
- 169 p. ; 24 cm.
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.