Auschwitz-Birkenau is the site of the largest mass murder in human history, but beneath the ruins lie stories of incredible resistance and deep mystery. In this documentary, we investigate the “Auschwitz Sketchbook”—clandestine drawings hidden in a bottle that reveal the inner workings of the gas chambers. We follow the footsteps of Witold Pilecki, the Polish officer who spent 947 days inside the camp to report the truth to the world, and explore the dark irony of Commandant Rudolf Hoss’s family life just feet away from the chimneys.