The Invisible Bridge Julie Orringer.

This tome reminded me a bit of Gone with the Wind: a love story set with the backdrop of a war, in this case WWII.  A good pat of schmaltz.  Most of the main characters make it through the war although statistically (according to Wikipedia) roughly 75% of Hungarian Jews perished in the Holocaust. Statistical probabilities aside, I enjoyed absorbing a cursory history of 20th Century Hungary in this book. The government collaborated with the Nazis and sent scores of soldiers to the Russian Front.  In the novel, Jewish regiments help build roads and unload materiel for soldiers.

About Hungarian Jews, the only reference that I have was the 1999 movie Sunshine with Ralph Fiennes. Good to have another perspective, though much of the Invisible Bridge takes place in Paris.