The Flying Scotsman opens with a wedding -- and an attempted assassination that brings several nations to the brink of war. To keep the peace a Prince must be smuggled back to his own country aboard the Flying Scotsman, the fastest train between London and Edinburgh.
Disguised as journalists, Mycroft and his secretary, Paterson Guthrie, are charged with the Prince's safety. Also aboard the train are Pauline Gatspy, an anarchist, and Sir Cameron Macmillan, with whom Mycroft and Guthrie have tangled before. Is one of them the assassin, or do they have innocent motives for traveling on the luxurious train?