"You and me - we’re sisters, not enemies. We’ve got a real enemy at our door and we need to focus on that - together, united. I don’t want to be fighting you as well."

In the small French town of Colmar, swastikas hang from lampposts, tanks are lined up outside the town hall, and 21-year-old Marie-Claire is in love. She will do anything for her childhood friend Jacques, including spying on her German boss, Dietrich Kurtz. Anything to make Jacques see her in a new light, as something more than just a silly little girl.

But when Jacques rejects her, everything changes. Mortified and stung, Marie-Claire feels the need for revenge. She turns her back on those she loves and is catapulted into a new life.

Her little sister Victoire is aghast at her sister’s traitorous behavior, not least because Marie-Claire is endangering Victoire’s own life-threatening mission, hiding Jewish refugees in their mother’s wine cellar. And when Marie-Claire marries Kurtz, Victoire knows her relationship with her sister has been poisoned for ever.

But when Victoire learns someone she loves is in terrible danger, her only choice is to trust the sister who betrayed her. Kurtz, Marie-Claire’s cruel and heartless husband, has key information and Victoire must persuade Marie-Claire to obtain it, even if it means risking Marie-Claire’s life. As secrets come to light and close bonds are broken, will the sisters be able to heal old wounds?

An unforgettable story of two sisters ripped apart by World War II. Fans of The Nightingale and The Ragged Edge of Night will fall in love with Her Darkest Hour.