When an explosion in the Tui Glen cave traps a group of senior students, Gilbert Hastings' partner Christina and the Department of Conservation guide, Kere Hawker, Gilbert Hastings is asked to discover who set the bomb and why. He searches for another way to get into the cave where his partner is trapped. With no hope of immediate rescue, the people underground must find ways of staying alive. On the surface, Jade's daughter Amber is mistaken for...