1855. The railway has irrevocably altered English society: a whole day's journey can now be covered in a matter of hours. This brings freedom-- and danger. When a gentleman is stabbed to death in a locked first-class passenger compartment, the crime paralyzes London. In the next compartment, Thomas De Quincey and his daughter, Emily, discover the homicide in a most gruesome manner. They join forces with their allies in Scotland Yard, Detective Ryan and his partner-in-training, Becker, to pursue the killer. Ultimately, De Quincey must confront two ruthless adversaries: this terrifying enemy, and his own opium addiction which endangers his life and his tormented soul. Opium addict Thomas De Quincey and his irrepressible daughter Emily investigate the strangling of a lawyer in what is the first murder on an English train, and they uncover a dangerous secret that reaches the highest levels of British society.