yeah,
Animal Farm's first legal issue in Poland is only 1988, it was popular earlier, but it was on a black list, so only underground editions existed
the angle of concentration camps and jewish minority
probably Tadeusz Borowski's
This Way for the Gas, Ladies and Gentlemen, a collection of short stories, some about the life in the occupied Warsaw, some about Auschwitz (Borowski was imprisoned 1943 and sent to Auschwitz, later transferred to Dachau)
And my favorite book, reading it was a harrowing experience, is Zofia Nałkowska's
Medaliony, it was obligatory in high school, otherwise I wouldn't have probably started to read it, I don't like Polish martyrology too much, but this short stories deserve reading.
and Ronek mentioned lots of adventure-war books, I guess he likes them, but don't get the false impression that Polish literature is all about fighting, it's not, though it's not so hard to find references to battles or living under occupants' oppression even in books dealing with different themes, because in the last 230 years Poland was ruled by foreign forces quite a lot, so it was very hard to completely ignore those circumstances
and I hated movie/TV series of both "Przedwiośnie" and "Ogniem i mieczem", so I wouldn't recommend them to anyone, just read the books, if you want (and I'm not aying that because I'm a bookworm, actually I prefer movies, just well made)