Anna teaches violin at a music school, her husband is an instrument-maker. They have a 10-year-old son, Jonas. At school, Anna champions young Alexander, in whom she alone sees great talent. She devotes much energy and attention preparing him for the next stage exam to prove she was right. Soon Anna devotes more time to him than to Jonas, bringing the two boys into rivalry. At the same time her marriage is collapsing, she withdraws increasingly from her own family and starts an affair with her colleague Christian, who is encouraging her to join a quartet. When she fails during their joint concert, the pressure mounts. With Alexander now her vehicle, she drives him ever onwards and upwards. Come the day of the exam, events take a tragic turn…

East Germany. Summer, late 70’s. Three years after her boyfriend Wassilij’s apparent death, Nelly Senff decides to escape from behind the Berlin wall with her son Alexej, leaving her traumatic memories and past behind. Pretending to marry a West German, she crosses the border to start a new life in the West. But soon her past starts to haunt her as the Allied Secret Service begin to question Wassilij’s mysterious disappearance. Is he still alive? Was he a spy? Plagued by her past and fraught with paranoia, Nelly is forced to choose between discovering the truth about her former lover and her hopes for a better tomorrow.