There are a wide variety of books about the Nazis.

What about suggesting one book about the rise of fascism like Guerin's the Brown Plague or Goodbye to Berlin,

One book about civilians under fascism like Hans Fallada Alone in Berlin or a mission for the Nazis like a Small Death in Lisbon

One Holocaust survivor story like the Hiding Place or Night by Wiesel, or Man's Search for Meaning

Another option is fiction or nonfiction about the Warsaw ghetto.

There is a rich heritage of art and memoir on this topic.

There are even adventure stories like the Perfect Horse