"One of the Sunday Times paperbacks of the Year 2020 One of the Financial Times best books of 2020 'Totally gripping'-- Simon Sebag Montefiore 'Pilecki is perhaps one of the greatest unsung heroes of the second world war ... this insightful book is likely to be the definitive version of this extraordinary life' -- Economist Would you sacrifice yourself to save thousands of others? In the Summer of 1940, after the Nazi occupation of Poland, an underground operative called Witold Pilecki accepted a mission to uncover the fate of thousands of people being interned at a new concentration camp on the border of the Reich. His mission was to report on Nazi crimes and raise a secret army to stage an uprising. The name of the detention centre -- Auschwitz. It was only after arriving at the camp that he started to discover the Nazi's terrifying plans. Over the next two and half years, Witold forged an underground army that smuggled evidence of Nazi atrocities out of Auschwitz. His reports from