The ancient underground caves were in danger — they were going to be filled with atomic waste. But forces were at work to save the sacred ground — forces from another time.

Why did the caves contain mysterious symbols and how did the legend of King Arthur connect with them? What power did Professor Young, the archaeologist have to save the cave complex? And why did the merlin suddenly appear?

Raven, on probation from Borstal, found himself caught up with these strange powers, and began to realise that the future of the caves depended on him...