In 2016, an album containing 250 previously unseen photos of Nazi officials was discovered in the USA by Stephan Hördler, a prominent Holocaust historian, who immediately understood the album's inestimable value. The album brings together photographs of a "group of friends," all from the same region of Germany, all of whom became SS men. From 1928 to 1943, the photo album allows us to follow their journey. Hördler conducted the investigation, comparing the photos in the album with other, better-known ones, the faces of these men with those of concentration camp officials, and ultimately revealed that it was at Lichtencburg that these young men were trained, a "school" for future camp executioners, and the bonds of camaraderie and informal network that would allow them to help each other, even after the war.