British media tycoon Sidney Bernstein recruited Alfred Hitchcock to help create a documentary film out of massive footage that had been collected by British and Soviet army film units at Nazi concentration camps after World War II. The footage was so distressing that at first the director didn’t show to work at Pinewood Studios for a week. The film was last heard of when five of the six completed reels that were silently shelved at the Imperial War Museum was discovered.

The footage was revived in the 1980s and then screened in poor quality without the missing reel during the Berlin Film Festival. The original cut has been restored now with the missing sixth reel added. There are plans to show the documentary on British television in early 2015 which will mark the 70th anniversary of the end of the war, with Stephen Frears serving as directorial advisor. After airing on British television, the two documentaries will be played together at as-yet-unnamed worldwide festivals.

The complete footage is certain to be controversial particularly the absolutely shocking footage from the Belsen-Bergen concentration camp. It can even be compared with the Death Mills which is an American film that likewise covered Nazi outrages.