There is nothing stronger than a promise between sisters. Not even a war.

Lyon, 1941. As Nazi forces march steadily through France and Jewish families seek refuge from persecution, seventeen-year-old Juta wakes one morning to find her sister, Sara, gone. And when Juta discovers that Sara has been wrongfully accused of espionage and arrested by German soldiers, she traces it all back to one man. A cruel, obsessive man who believes himself scorned by her family and who will stop at nothing to see them suffer. Arno.

Despite Juta's desperate bid to free her sister, she finds she is too late. Sara has been subjected to a horrific interrogation from which she will never recover.

With the urge for revenge burning in her veins, Juta leaves behind everything she knows and vows to bring her sister's tormentor to justice. Joining the French resistance, she rises in the ranks, biding her time, waiting for a chance to face Arno once more.

Juta will endure anything to keep the vow she made to her sister. Even if it means giving up her own freedom. Even if it means forfeiting her life.