Poland, winter of 1945. Mathilde Beaulieu (Lou de Lâage) is a young intern working with a branch of the French Red Cross. They are on a mission to find, treat and repatriate French survivors of the German camps. One day, a Polish nun arrives in the hospital. In very poor French, she begs Mathilde to come to her convent. Mathilde life and beliefs change when she discovers the advanced state of pregnancy that affect several of the Sisters of the convent just outside the hospital where she performs.

A vision of an unconventional family together with their conflicts and rivalry, a vision full of ironic sense of humour but also emotional moments and true closeness. When the elder brother, Andrzej, suddenly falls ill, despite their differences and a wall of misunderstandings that has grown between them, his younger brother is taking it upon himself to care for his brother in need.