1861, East Anglia. Alone in a first-class carriage, the Swarbricks are robbed at gunpoint, but when the universally-admired Swarbrick fights back, the train robber takes more than money and jewellery, killing the man working to unify East Anglia's tangle of railway networks. Inspector Colbeck is brought in from London, as the only detective in Britain with enough expertise for the job. But as Swarbrick's glowing reputation begins to crumble, the line...