I'm really hoping my meager description will be enough to ID this book. It was a pretty small book located in the nonfiction section of my local public library, in the US. I read it during 2015/2016, in English. It was in first person from the perspective of the journalist who was staying in Germany, and alternates to third person when describing historical events.
It was an adult nonfiction book about a female journalist who travels to Europe (Germany, I believe), and stays in an apartment while she tries to piece together the life of a woman who lived during WWII. There was a person named Miriam. I can't remember her exact involvement, but she was a major part of the book. It was bittersweet and interesting.
I half-remember the ending: the journalist goes to a museum and goes through their archives and artifacts. Also, I remember Miriam (I think) and her husband had a very interesting relationship: they loved each other, but they didn't spend much time together. Oftentimes, because their work was unpredictable, one would be leaving while the other would be arriving home. But, the journalist explained that that kind of relationship worked well for them.
Spies, maybe? Leaflet distributors? I can't remember anymore.