There are SO MANY books about Auschwitz: fiction, memoir, and historical. I think most people have probably read at least one. Here are a few that I have read within the last few years. If you have another one that you found insightful and worth reading, please leave the name of the book in the comments.
Man's Search for Meaning
by Viktor Frankl
Perhaps the first significant book written about Auschwitz, this book was published in 1946 and is considered one of the most influential books of the 20th century. I first read this book when I was in high school, and while some of the deep psychological underpinnings of the second half of the book escaped me then, I nevertheless had a profound experience as I read about Frankl's experiences as detailed in the first half of the book. The older I get, the more meaningful his discussion of choosing one's response to suffering becomes.
My favorite quote from the book is this: "Everything can be taken from a man but one thing: the last of human freedoms--to choose one's attitude in any given set of circumstances, to choose one's own way."

by Viktor Frankl
Perhaps the first significant book written about Auschwitz, this book was published in 1946 and is considered one of the most influential books of the 20th century. I first read this book when I was in high school, and while some of the deep psychological underpinnings of the second half of the book escaped me then, I nevertheless had a profound experience as I read about Frankl's experiences as detailed in the first half of the book. The older I get, the more meaningful his discussion of choosing one's response to suffering becomes.
My favorite quote from the book is this: "Everything can be taken from a man but one thing: the last of human freedoms--to choose one's attitude in any given set of circumstances, to choose one's own way."