If you are younger than me you may have read this in school. I didn't read it until last night. It's a slim volume - only 110 pages. But it's enough. When the author was 15 he was rounded up in Hungary and shipped off to Auschwitz.
These 110 pages are the story of his time there. I could write more, but I can't possibly convey the power of his story.
Just read it.