It is 1942 and Eva Adami has boarded a train to Auschwitz. Barely able to breathe due to the press of bodies and exhausted from standing up for two days, she can think only of her longed-for reunion with her husband Michal, who was sent there six months earlier.

But when Eva arrives at Auschwitz, there is no sign of Michal and the stark reality of the camp comes crashing down upon her. As she lies heartbroken and shivering on a thin mattress, her head shaved by rough hands, she hears a whisper. Her bunkmate, Sofie, is reaching out her hand . . .

As the days pass, the two women learn each other's hopes and dreams - Eva's is that she will find Michal alive in this terrible place, and Sofie's is that she will be reunited with her son Tomas, over the border in an orphanage in Austria. Sofie sees the chance to engineer one last meeting between Eva and Michal and knows she must take it even if means befriending the enemy.

But when Eva realises she is pregnant she fears she has endangered both their lives. The women promise to protect each other's children, should the worst occur. For they are determined to hold on to the last flower of hope in the shadows and degradation: their precious children, who they pray will live to tell their story when they no longer can.