The Berlin Sisters by Soraya M. Lane

Berlin, 1943: Ava Müller is a proud supporter of the German war effort, working for Joseph Goebbels alongside her father, a high-ranking official in the Reich. With her sister Hanna, a nurse, braving bombing raids to save lives, they are a model Nazi family. Until Ava discovers her parents and Hanna are secretly working for the resistance…
Returning to their country home, Ava is shocked to find her childhood friend Eliana Goldman and her family hidden in the attic. Suddenly she faces a stark choice: denounce her family, as she’s been taught, or betray her country. She knows only too well what happens to traitors—but as Eliana’s story of terror at the hands of the Nazis unravels, Ava realises her loyalty to the regime has blinded her to the horrifying truth.
Drawn into the resistance network alongside Hanna, Ava begins the dangerous work of undermining the Reich from within its own headquarters. Relying on each other for courage and resilience, the sisters must risk their own lives to save others, knowing that every day brings them one step closer to making the ultimate sacrifice…