Twins of War: Part 1 The Vow by Dana Levy Elgrod

"Twins of War: The Vow" tells the story of two sisters, Ania and Michalina, during World War II. Separated by the chaos of war, Ania vows to protect Michalina's love, Anton, while Anton secretly makes the same promise about Ania. Forced to survive in a war-torn city, their loyalty to their loved ones and themselves is tested as they navigate the dangers and uncertainties of the conflict.