This is a strange book that put me in mind of Pauline Fisk's award winning "Midnight Blue". Dinah is a bright young girl with a challenging childhood. Her mother has a new boyfriend with a dilapidated house in Cardiff that they move into. But the relationship between Dinah and the boyfriend - Gomer - is a poor one, with no love lost on either side.
Somehow Dinah manages to unleash forces relating to the stone images at the nearby castle. The ensuing story is somewhat disturbing - and the question is whether she will be able to control the forces she has unleashed. Will her school friends be able to help?
This is an interesting, and somewhat strange book. Worth reading though.