“The True Story of the Resistance Hero who Infiltrated Auschwitz”
This is the best way to describe this book. It is not a first hand account, but it has many other interesting qualities that bring a morbid story to life. It serves as a narrative to Witold Pilecki’s life. He served as a Polish underground operative. He had to gather proof of mass murder and abuse from inside Auschwitz itself.
It is an extremely well researched book, and very educational on such an important topic.