London. A city drowning in fog. Amid that fog, a man with no name dies above a strange junkshop. Threads of mist and intrigue weave around a court case with no resolution, linking great country houses with the lowest slum in the city, mingling the high-born with a boy who sweeps the filthy streets, enshrouding devious plots and sudden murder, bringing together two extraordinary women – Lady Dedlock and Esther Summerson – who seem to have nothing whatsoever in common but who will find themselves inextricably linked.