It is London, 1880, and Lucas Jarmyn struggles to make sense of the death of his beloved youngest daughter; his wife, Aurora, seeks solace in rigid social routines; and his eighteen-year-old daughter Dinah looks for fulfilment in unusual places. Only the housekeeper, the estimable Mrs Logan, seems able to carry on.

A train accident in a provincial town on the railway Lucas owns claims the life of a young child and, amid the public outcry, a father journeys to London demanding justice. As he arrives in the city on a frozen January morning he finds a family with a terrible secret tearing their lives apart.