This is an excellent novel not only about "The Girl from Krakow," but about the emancipated/assiimmilated Jewish middle class of Poland. The story takes place in 1935-47, mostly in Poland, but with several chapters in Spain, Russia and Germany as well. All but one of the important characters survive, but the tone and ending are not really happy. However, the characters are well developed and the ending reflects the millieu. The millieu of the various countries is also accurate, although it may come as a surprise to readers not familiar with the countries. There is also some sex, including homosexual and lesbian, but it is tastefully handled and appeared a logical part of the story. There are many twists and much suspense - a real page turner. The life of the protagonists may seem fantastic or at least fanciful, but Occupied Europe and especially Poland, were very strange places and there are documented stories of survival which easily fall into the "stranger than fiction" category.
As for nitpicking: an oberst is not a captain, the few German phrases in the book are mostly wrong.and the US 44th Infantry Division probably did not liberate Heidelberg. There is also a lot about the implications of Darwinism and this part might have been shorter.
But, all in all, this book is definitely one to read and keep.