A beautiful, intelligent young woman – is she a traitorous spy or a patriot? An aristocratic soldier permanently injured during the war – is he a patriot or is there more to him than meets the eye? A clandestine meeting on a beach – espionage or peace movement?

The setting is the years prior to the outbreak of World War I. It is a time when Germany is outwardly preparing for war but Britain continues to believe it is invincible and that no one would challenge her. A vast German spy network flourishes in England, often in plain view. The main character is Francis Norgate, an aspiring British diplomat who falls in disfavor with his superiors for defending a woman while stationed in Berlin. The resulting scandal causes Norgate to be recalled. On the way home, he meets a German gentleman, Selingman, who claims to be a crockery salesman...

A conference of European nations is being held in the Hague. England has not been invited to attend. Some think war is about to break out. Mr. John P. Dunster, an American, is traveling to the Hague with an important document that may prevent the outbreak of war when he mysteriously disappears after a train wreck in England. Richard Hamel is asked by the British government to attempt to solve the mystery of Dunster’s disappearance and prevent the outbreak of war in Europe.