The age of coal has passed. Rosengrave mining town, northern Wales is a throwaway land of mist and quartz; slate and coal. LOTS of coal, lying unwanted in ground heaps; in abandoned and unmined seams. So Rosengrave is dying, cast aside to the mercies of the economic winds. Even the hottest summer ever recorded is doing little to lift the spirits of the town and its inhabitants.Morwen Lundy, an introspective, asocial teenager traumatised by past bullying at school and divorce at home has an ace up her sleeve to help her get out of town! She's found the lost village of Gravenhead, hidden all the while beneath an isolated lake she's come across in the mountains. But the lake is drying up in record temperatures and as the levels recede and the village is exposed, Morwen finds that the layers are coming off her own town, as well: that not all monsters are buried under deep water, and that some ghosts find it hard to go to sleep.