1929: Marie Lehning, a farm worker from Warmsdorf on the Baltic Sea, falls in love with the fisherman's son Mingo. Both complete an apprenticeship in Lübeck. Marie wants to become a seamstress, Mingo a carpenter. After their first night of love, they swear eternal fidelity. But Marie has to return to the village, her mother is ill and her siblings are unprovided for. She starts working as a maid on a farm. Unexpectedly, she meets the young Kurt Meier from Berlin, whom she knows from before.

Bienchen is a little girl who is very worried regarding the private life of her older brother.