Helena and Ruth Nowak are sisters caught up in the struggle of Nazi occupied Poland. When Helena discovers a Jewish Allied paratrooper, wounded but alive, she risks the safety of herself and her family to hide him. As her feelings for the soldier grow deeper, she finds her loyalties torn. Outraged at this impulsive choice that endangers them all, mild-mannered Ruth finds herself becoming increasingly jealous of Helena. As tensions are sparked, a singular act of betrayal unleashes a chain of events that will endanger them all and reverberate for decades to come.