A foul thing: Roma and Juliette have established themselves as the heads of an underground weapons ring in Zhouzhuang, making a living the way they do best while remaining anonymous in their peaceful, quiet life. But when they hear about several Russian girls showing up dead in nearby towns, they decide to investigate--and ultimately discover that this mystery is much closer to home than they ever imagined.
This foul murder: Benedikt and Marshall have been summoned by Roma to find the elusive scientist, Lourens, and bring him to Zhouzhuang. Time is of the essence aboard the week-long Trans-Siberian Express, but when someone is murdered on board, Benedikt and Marshall convince the officer in charge not to stop the train so that they aren't thrown off-schedule. Instead, they pretend that they are investigators and promise they can solve the murder, but as they dig deeper, they realize that the murder might having surprising ties to their own mission...