Many years ago Jo Grant met Professor Clifford Jones, fell in love and saved the world. It all happened in the idyllic Welsh community of Llanfairfach.

Josephine Jones has come back to Llanfairfach and she finds it a bustling place with a thriving economy. The little town is now at the spearhead of a healthy-eating revolution. And yet, something’s missing. It feels like the heart has gone out of the place.

She falls in with a dashing stranger and realises that although the past was a lot simpler, not everything’s changed. There’s still something nasty in the mine, and it’s been waiting for Jo for a very long time.