On 29 September 1945, the incomplete rough-cut of a disturbing yet compelling documentary revealing the horrors of the Nazi concentration camps was viewed at the Ministry of Information in London. For five months, Sidney Bernstein had led a small team - which included Stewart McAllister, Richard Crossman and Alfred Hitchcock - to complete the film from hours of footage. Unfortunately, this ambitious Allied project to create a feature-length visual report that would damn the Nazi regime and shame the German people into acceptance of Allied occupation had missed its moment, and was left unfinished and shelved. Even in its incomplete form, the film was immensely powerful, generating an awed hush among audiences. But now, complete to six reels, this faithfully restored and definitive version produced by the Imperial War Museums and with a newly recorded narration by actor Jasper Britton, has been rightfully compared with Alan Resnais' Night and Fog (1955).