Alma and Eva are best friends. More than that, they are “sibling friends”, as they were both born in the same year, month, day, city, and street, one only a couple of hours before the other. Since their early childhood, they spend time together, play together and help one another when they need. Even though they are sibling friends and as everybody else have two eyes, one nose and one mouth, many people say they are completely different from one another to the point that they couldn’t even co-live in the same street, in the same city, in the same country.

Alma and Eva are growing up during the Second World War, when people would face the most challenging difficulties. One of them being the prohibition of getting together with the beloved ones. By then, the world was divided: two opposite sides were fighting to know who would win, and nobody would live calmly and happily, even if on the victorious side. But the girls’ friendship resists to everything, thanks to their courage to be together and to that old star. It belongs to Eva, but she doesn’t hesitate to give it to Alma when her sibling friend most needs it. A baby born in the Auschwitz-Birkenau barracks in October 1944. A Sonata composed by a young German officer, on the same date, also in Auschwitz. Two stories that cross paths and complete each other. Decades later, Amalia, Portuguese daughter of a German father, starts to lift the veil that covers the Nazi past of the family from a musical score revealed by an unknown great-grandmother, signed by her grandfather Friedrich and entitled Für Haya (for Haya).