Pick

1. Pride and Prejudice by Jane Austen; a classic feminist novel.
2. Night by Elie Wiesel; a scarring memoir about the Holocaust.
3. All the Light We Cannot See by Anthony Doerr; a novel set during WW2 that will give you two conflicting perspectives of the war from a blind French girl during the Paris invasion and a German boy whose skills make him a valuable member of the military.

I think these selections give wiggle room for your group as the third novel isn't solely focused on the Holocaust.