It is New Year's Eve 1915 and the Hardcastle family are welcoming 1916 at their home in Kennington, London. But an hour into the New Year, Hardcastle is called to a murder in a jeweller's shop in Vauxhall. In a first for the A Division senior detective, the killers apparently made their escape in a motor car. As Hardcastle's enquiry progresses, what he believed to be a fairly straightforward investigation turns into one with ramifications extending...