1660 England. General Edward Whalley and his son-in law Colonel William Goffe board a ship bound for the New World. They are on the run, wanted for the murder of King Charles I—a brazen execution that marked the culmination of the English Civil War, in which parliamentarians successfully battled royalists for control.

Berlin, 1964. The Greater German Reich stretches from the Rhine to the Urals and keeps an uneasy peace with its nuclear rival, the United States. As the Fatherland prepares for a grand celebration honoring Adolf Hitler's 75th birthday and anticipates a conciliatory visit from US president Joseph Kennedy and ambassador Charles Lindbergh, a detective of the Kriminalpolizei is called out to investigate the discovery of a dead body in a lake near Berlin's most prestigious suburb.

All along the Mediterranean coast, the Roman empire’s richest citizens are relaxing in their luxurious villas, enjoying the last days of summer. The world’s largest navy lies peacefully at anchor in Misenum. The tourists are spending their money in the seaside resorts of Baiae, Herculaneum, and Pompeii. But the carefree lifestyle and gorgeous weather belie an impending cataclysm, and only one man is worried.

Hugh Legat is a rising star of the British diplomatic service, serving at 10 Downing Street as a private secretary to the Prime Minister, Neville Chamberlain. Paul von Hartmann is on the staff of the German Foreign Office - and secretly a member of the anti-Hitler resistance. The two men were friends at Oxford in the 1920s, but have not been in contact since. Now, when Hugh flies with Chamberlain from London to Munich, and Hartmann travels on Hitler's train overnight from Berlin, their paths are set on a disastrous collision course.

Paris in 1895: Alfred Dreyfus, a young Jewish officer, has just been convicted of treason, sentenced to life imprisonment at Devil's Island, and stripped of his rank in front of a baying crowd of 20,000. Among the witnesses to his humiliation is Georges Picquart, the ambitious, intellectual, recently promoted head of the counterespionage agency that Dreyfus had passed secrets to the Germans. At first, Picquart firmly believes in Dreyfus' guilt. But it is not long after Dreyfus is delivered to his desolate prison that Picquart stumbles on information that leads him to suspect that there is still a spy at large in the French military.