The Good German (2006)

Berlin, July 1945. Journalist Jake Geismer arrives to cover the Potsdam conference and issued a captain's uniform for easier passage. He also wants to find Lena, an old flame who's now a prostitute desperate to get out of Berlin. He discovers that the driver he's assigned, a cheerful down-home sadist named Corporal Tully, is Lena's keeper. When the body of a murdered man washes up in Potsdam (within the Russian sector), Jake may be the only person who wants to solve the crime: U.S. personnel are busy finding Nazis to bring to trial, the Russians and the Americans are looking for German rocket scientists, and Lena has her own secrets.