Based on a novel of the same name, which was in turn based upon a real-life Auschwitz librarian, this graphic novel largely didn't feel like an adaptation. That said, I didn't read the novel, so it would be hard to compare. I imagine that some scenes would have been more elaborated on in an novel, and probably elicited more of an emotional response. Then again, pictures can evoke an emotional wallop as well so it's not like the comic was lacking.
Besides the obvious takeaways from the book about racism, homophobia, genocide, it also spoke to me as a librarian and really struck a chord about why libraries are so important, even in a place like Auschwitz where one might be inclined to think books would not be a high priority. Or stories themselves. I loved, for instance, that they acknowledged people as human books (not a modern idea) which in itself speaks of the loss the Nazis inflicted on the world.
The art was good, in a very familiar style I see among young adult comics, and colouring which fit the mood.