In the early 1940s, countless Jewish families were imprisoned in the Warsaw Ghetto before being led to their deaths by the Nazis. Amidst this horror, one young Jewish girl is smuggled out of the ghetto, sent to live on the other side of Warsaw with Helen Dobinski, a friend of her mother. Helen's Catholic faith and her friendship with the girl's mother compels her to keep the young child safe from harm. But Helen's heroism comes at a cost. Because harboring a Jewish person is a crime to the Nazis, with severe punishment - even death - as the penalty.

It is 1919 in Siberia. Michal - a young, sheltered girl - has eyes for a man other than her betrothed. For a young girl growing up in a traditional Jewish settlement, an arranged marriage is a fact of life. However, destiny, it seems, has other plans for Michal. When a Cossack pogrom invades her small village, the protected life Michal has grown accustomed to and loves will crumble before her eyes. Everything she knows is gone, and she is forced to leave her home and embark on a journey to Berlin with the man she thought she wanted.

When Matilda’s childhood sweetheart, Hans, is in danger, she doesn’t hesitate to hide him in her attic. Protecting him from her parents and the soldiers downstairs, she smuggles him food and communicates in whispers. For months, they exist by candlelight. But how long can they survive? 

When three little girls—Anna, Bernie, and Elica—make a pact to be blood sisters for life, they believe nothing can come between them. Anna is from an affluent Jewish family, while Bernie and Elica are from poor Austrian families who barely make ends meet. As they get older, their social differences become all too real. With infectious Jew-hate-laden rhetoric from Nazi Germany spreading into Austria, it is only a matter of time before their bond of friendship gets severely tested.

In a world filled with danger, heartbreak, and impossible choices, the blood sisters must navigate through the darkness to find love, redemption, and a chance at survival.