The story of how one member of the Sweetwater family becomes embroiled with the Jones family - in a way that leaves them inextricably linked for centuries . . . His talent is for hunting down human monsters. Her gift is seeing the ghostly images of murder and violence in mirrors. Both are alone in the world - until now. They must work together to unearth the significance of an elegant but deadly clock, until its dark energy consumes them both . . .