A. Fortis has some thoughts on two books set during WWII that you might have missed. First, The Welsh Girl by Peter Ho:
Three main characters: a British investigator trying to mask his background as a German Jew; Karsten, an eighteen-year-old German prisoner of war detained in a camp in North Wales; and Esther, a seventeen-year-old Welsh farm girl whose life changes both drastically and subtly in the aftermath of the war. The story itself is musing and pensive in tone--much of the drama takes place within the characters themselves. This is not a novel of battle action, but rather a nuanced portrayal of rural life at the end of the war.
And second, Markus Zusak's The Book Thief:
Told from a unique point of view--that of Death itself--The Book Thief relates the story of Liesel Meminger, a girl from a poor German family who goes to live with a slightly less poor foster family in the outskirts of Munich during the Second World War.