In 1942, Erik Eriksson, a Swedish American oil businessman living in Stockholm, suddenly found himself on the blacklist of Nazi collaborators in the United States, eager to distinguish. All this was arranged by the allied intelligence agencies to force Eric to become a spy because he could easily enter and leave Germany. Reluctantly, Eric had to give in. He began to show his closeness to the Nazis publicly, and even hurt his closest Jewish friend Kanpur. Friends and relatives alienated him, but only kemple secretly believed that Eric must have unspeakable reasons for doing so\ R soon, Eric got on with the Germans, and pulled German oil giant Sir Gerhard orendoff and oil businessman Otto hausz into the water to form a spy team. His code name was "Ryder"\ At the same time, Eric contacted Mariana, a member of the religious German underground resistance organization, disguised as a lover's tryst, cheated the monitored Gestapo, kept remembering the information she provided and brought it back to Sweden. Eric and Mariana are family misfortunes for their careers. They fall in love with each other. Although Eric is a recruit in the spy sea, he is calm and resolute and has avoided danger many times\ R with orendoff's efforts, Eric was allowed to "build" an oil refinery for Germany in Sweden, so he got the opportunity to visit the German oil factory. Once, Eric and orendoff were deeply touched by the scene of Nazi hanging strike workers, and began to change from forced work to conscious action. Their intelligence enabled the allies to accurately bomb, causing heavy losses to Germany\ R some time later, Otto died of illness. Because the secret letter might be leaked, the allied intelligence agencies decided to stop the activities of Eric's team. But Eric missed Mariana and decided to go to Germany again in order to get back the crucial information on Nazi aviation fuel production. As soon as Eric arrived in Berlin, he was put in Gestapo prison and witnessed the martyrdom of Mariana arrested for identity exposure. But he endured his grief and insisted that he was only Mariana's lover. The Gestapo had no evidence but to let people go\ R Eric got the information from Gerhard and went to Hamburg to destroy Otto's secret letter. Unexpectedly, he was noticed by the Gestapo who followed him. Eric escaped wisely and contacted the Allied spy network in Hamburg. With the help of underground organizations and Danish people, Eric crossed the border, crossed the Strait through Copenhagen and returned to Sweden safely.