Teenage neighbours Joe and Sarah don't normally get on, but strange happenings in their street force them to at least talk to each other. Amidst controversial fracking going on beneath their town's historic woodland, there have been strange disappearances - even deaths - as well as dead-of-night sightings of hideous, fabled creatures. Can Joe and Sarah discover what they are, and where they're coming from, before it's too late?

Terrifying and suspenseful enough to keep reluctant readers gripped right to the end, Simon Cheshire has hit the mark with this ALL NEW Teen Read.

And, as if the idea of an army of monsters wasn't scary enough, Simon has made a late title change and scaled up the horror. What was simply Underground is now Underworld, and we can only imagine the implications...