According to the author's plan, the novel 'The Secret of the Master' shows the confrontation between two systems - good and evil. On the side of the forces of light, the main character is Heinrich Steiner, a native of a German colony. In the early thirties of the twentieth century, while serving in a Soviet air squadron near a secret German flight school, military pilot Heinrich Steiner was recruited by local security officers to work to expose German agents. Then events will occur as a result of which he will illegally leave the Soviet Union and end up in the lair of Nazi Germany. And it all started with the fact that in his youth, on the territory of the German colony of Novosaratovka, Heinrich Steiner accidentally came into contact with the secret of his ancestor - the gunsmith Fritz Beach, a story that began two centuries ago in Germany. The master, being persecuted by a secret order, came to St. Petersburg in 1703. The cause of the conflict with the order was a mysterious capsule belonging to the Master, which will disappear after his death. After many years, the search for the capsule will resume because it will be the missing link in solving the problems of a powerful order. At the same time, at a secret base in Germany, major German scientists and engineers, with the assistance of mediums, are working on the Jupiter project. Their goal is to create an ultra-modern aircraft. Heinrich Steiner will be involved in the complex events of this very mysterious story and will be able to infiltrate a secret facility of Nazi Germany in order to carry out a special task for the Soviet security officers.