What books would you recommend that provide important lessons and/or information for communities that have gone through genocide?

I am interested in growing the book list over on r/Tigray. Aside from books directly related to Tigray, the book list is lacking when it comes to both fiction and non-fiction books that aren't directly on Tigray. So far, the only book in the fiction section is 1984 and the only book in the non-fiction section, that's not directly writing about Tigray, is Wretched of the Earth.

What books have you read, or know of, that you feel are must reads (whether due to the information or the lessons they provide) for people from nations that have gone/are going through terrible experiences?