The Edge - Dick Francis

A high-class, transcontinental horse-racing junket should be an idyllic getaway for the super-rich. However, one passenger on this train is a sociopath, a genius at blackmail and criminal corruption, who plans to take everyone for everything they've got. A high-class, transcontinental horse-racing junket should be an idyllic getaway for the super-rich. But one passenger on this train is a sociopath, a genius at blackmail and criminal corruption--and he plans to take everyone for everything they've got.