A powerful documentary about the liberation of the Nazi concentration camps and how combat and newsreel cameramen filmed the almost unbelievable scenes they found there. When Allied forces liberated the Nazi concentration camps in 1944-45, their terrible discoveries revealed for the first time the full horror of what had happened. Making use of British, Soviet and American footage, the Ministry of Information's Sidney Bernstein aimed to create a documentary that would provide lasting, undeniable evidence of the Nazis' unspeakable crimes. He commissioned a wealth of British talent, including his friend Alfred Hitchcock. There were even secret talks with Hollywood director Billy Wilder, himself an Austrian refugee from the Nazis. But despite initial support from the British and US governments, the film was shelved. It was considered too sensitive for the rapidly changing political climate.