“The Catcher was a Spy” is based on the true story of major league player Moe Berg, who played for several professional baseball teams in the 1920s and 30s before joining the Office of Strategic Services (OSS) during World War II and working as a covert agent.
In 1936, Moe Berg played for the Boston Red Sox on a goodwill baseball exhibition tour of Japan. Berg secretly sneaks onto the roof of a hospital to film the harbor and the shipyards. He shows this film to the head of the OSS. He is impressed by his skills and his willingness to take risks, and thanks to his excellent language skills, he hires Berg. Berg is then smuggled to Italy and from there to Switzerland to find out whether Heisenberg, a famous quantum physicist who was to build an atomic bomb for the Nazis, is close to his goal. If this was the case, Berg's task would be to assassinate Heisenberg.