Our Darkest Night by Jennifer Robson

It's the 1940s in Venice. Antonina Mazin is Jewish, the daughter of a physician and his wife, who is in a rest home due to poor health. As the war continues, her father becomes increasingly concerned about Antonina and hatches a plan with a priest friend for a Catholic farmer in the countryside to shelter her and pretend that she's his wife until the war is over. She does not want to leave her parents, but her father convinces her that her mother is too weak to travel, so she must go off with Nico (the farmer), who is a good man. When they arrive at his family's farm, Mezza Ciel (Halfway to Heaven), his sister Rosa is very rude. And Antonina (now called Nina) has a hard time adjusting to life in the country and the hard work of running a farm. But things are improving until one day a Nazi who had gone to school with Nico shows up. He is jealous of Nico and suspicious about the appearance of his wife. He is determined to get both Nico (who, unbeknownst to him, has been helping Jewish families escape) and Nina (whose story he isn't buying) and continues to threaten Nico's entire family.

I won't give away the whole plot but Nico and Nina grow closer, the nasty Nazi keeps causing trouble, and the last year of the war is very difficult for everyone. It's a good story with endearing characters. And it's not the typical World War II setting.