August 1945. A religious community close Warsaw (Poland) has a dull mystery. Mathilde Beaulieu is a youthful specialist sent by the Red Cross to guarantee the repatriation of French detainees injured on the outskirt amongst Germany and Poland. Yet, the astonishment comes when they find that a substantial part of the cloister sisters are pregnant by Red Army troops. Despite the fact that Mathilde is experience, must figure out how to convey forward this surprising circumstance and to help the sisters.