Some land should never be built upon

Called to a newly-built low-rise block of flats on a Cornwall housing estate, plumber Paul Cannon finds more than a blocked toilet to contend with. Teaming up with a pair of local police officers, Paul's humdrum existence is turned upside down as something old and hideous stirs in the foundations. The tenants are vanishing, the nosy neighbour is in uproar and there is something definitely wrong with the pipes.

Uncovering a nightmare that stretches into the town's distant, and often murky past, it's up to a rag-tag assortment of local characters to ensure that what lurks in the walls of that cursed building never makes it to the outside world.