Lisa was once a brilliant playwright, but she no longer writes. She lives with her family in Switzerland, but her heart remains in Berlin, beating in time with that of her twin brother Sven, a famous theatre actor. When Sven is diagnosed with an aggressive form of leukaemia, the relationship between them becomes even closer. Desperate to get Sven back onto the stage, she neglects everything else in her life and her marriage goes awry. But Lisa only has eyes for her brother, who reflects her deepest longings and awakens in her the desire to be creative, to feel alive again.