Challenges from Exploding Steamboats discussion

There are the Stieg Larsson books, so I might read The Girl Who Played with Fire for this one, since I've had a copy for several years now. But I've had Letters from the Earth: Uncensored Writings even longer.

For this one, I have read "Renia's Diary" by Renia Spiegel. Renia was 14 in 1939 when she started this diary. She was a Jewish girl living in Poland. When Germany invaded Poland, her mother was stuck in Warsaw, while she and her little sister were with their grandparents in the part of Poland which was taken over by the Soviets. Years later, the Nazis also invaded that area, and so they were directly put through the Holocaust. Renia was murdered by the Nazis in 1942, but her boyfriend saved her little sister and her diary. Only now has her sister read the diary and decided to have it published. It is filled with all the things a teenage girl might go through, plus war and separation from parents. Renia was a very good poet, and much of her poetry is here.

This could also fit the prompts for a book in translation (from Polish) and one that features letter or journal entries.