June 1941: Nazi troops surround the city of Leningrad, planning to shell and starve the people into submission. Most of the cultural elite is evacuated, but the famous composer Shostakovich stays behind to defend his city. That winter, the bleakest in Russian history, the Party orders Karl Eliasberg, the shy, difficult conductor of a second-rate orchestra, to prepare for the task of a lifetime. He is to conduct a performance of Shostakovich's Seventh Symphony - a haunting, defiant new piece, which will be relayed by loudspeakers to the front lines. Eliasberg's musicians are starving, and scared.