Peter Marker is an agent with the American Military Intelligence.
The time of his recorded activity starts in 1920, two years after the end of hostilities in Europe and one year after the Treaty of Versailles was finally drafted and approved. Germany had, for the moment, been cowed but tremendous concern remained in America about that continent and how it would fare with the new perceived menace, the Russian Bolsheviks.
Marker had during the bulk of the Great War in Washington, D.C., working with considerable distinction for a Colonel Hamilton and the two men had created a very good trust relationship. When America entered the conflict officially in April of 1917, Marker was sent to Europe to assume many roles in his position as an operative and worked tirelessly for the next 18 months traveling all over the Continent in one guise or another. His grasp of languages was such that he could pass himself as many different nationalities and the confusion that reigned everywhere helped immensely.
When the War ended, it was Hamilton to talked to Marker about staying on the job but this time keeping close tabs on the Russians instead of the Germans. Since Marker spoke excellent Russian as one of his languages, he was a perfect candidate to continue his espionage travels.
The adventures that have been written about Marker come from a series of journals he had written during his service and which he had entrusted to his close friend and confidant, Preshie Singletary. Actually, while there were dozens and dozens of journals filled with his observations during his missions, the two stories we have been allowed to see both came from Journal #5, indicating the man had a considerably larger cache of adventures that could have been told.