Horrors of War

Salt to the Sea is an incredible historical fiction novel about an incident during WW2 that I had not heard of, the sinking of the German MV Wilhelm Gustloff by a Soviet sub in 1945.  It was the largest incident of loss of life in maritime history.
Ruta Sepetys is a really incredible writer.  I think this is the third book of her's that I have read.
It is told of the POV from 4 people:  a German soldier with serious mental issues, a Prussian dude who is fighting Hitler under the radar, a young Polish girl and young woman with medical training.
A heart-breaking story about a horrific time in history.