Brilliant playwright, Lisa, no longer writes. She lives in Switzerland with her family but her heart has stayed in Berlin, beating to the rhythm of her brother's heart. The ties between the twins have grown stronger since Sven was diagnosed with an aggressive type of leukemia. He's a famous theater actor and Lisa refuses to accept his fate, moving heaven and earth to get him back on stage. She gives her all for her soul mate, neglecting everything else, even risking her marriage. Her relationship with her husband starts to fall apart, but Lisa only has eyes for her brother, her mirror, who connects her back with her deepest aspirations and rekindles her desire to create, to feel alive..