The first thing I want to say is - I do not recommend reading this book. The subject matter is densely negative and a downer as we used to say back in the seventies.
The writing is, of course, top notch. But. Yann. Please focus on something pleasant for God's sake. Literally. Someone who can write like Yann can is wasted on this kind of focus.
Listen to this writing. "To remain silent in the face of kindness and enthusiasm would have been rude." and "There's nothing like the unimaginable to make people believe." I'm not saying these are the best quotes they are random. He can write. I have vowed not to read, see or listen to anything more on the holocaust no matter how oblique.