My question would be WHAT book about the Holocaust? Is it something people may have already read or touched upon in school that they may not want to reread or feel like they're reading something similar (ex: lots of people read The Diary of Anne Frank and/or Night by Elie Wiesel), or are you looking to read something like a full on history book?

Personally I would want to avoid something really history-heavy themed if it was for a book club, but would be interested in something that may offer a new perspective or structure - something like Markus Zusak's The Book Thief or Art Spiegelman's MAUS (the latter of which has been recently challenged AND offers the new perspective and structure of the graphic novel format)

As for the thematics, there's nothing wrong with selecting something with difficult topics or themes. It also begs the question of what is the "vibe" of your book club? Are they looking for something specific like new releases? romance? maybe look at the previous selections and see what you can discern.

There's an episode of the Reading Glasses podcast that discusses this very topic - one of the co-hosts IS an author and she recommends the following:

- preorder the book if possible. This contributes to the "first week" sales of the author

- if you use your local library, you can request the library purchase certain titles for their collection for the community to check out

- Paperback purchases are completely ok!

- Even if you buy on Amazon/Kindle, the author still benefits from that in some way. BUT what also helps is making sure you leave a review of the book so others who may be purchasing from that place can see something positive