In an interesting precursor to the later „I Spy” television series, the novel follows the activities of a young British tennis professional, Mervyn Amory, who is spending the season in Monte Carlo. While traveling from Paris on Le Train Bleu, he meets an Italian secret agent who is carrying documents which show the treachery of the dictator Matorni. Matorni is a thinly disguised Mussolini. (The ti...