The film METROPOLIS is only available as a noticeably truncated cut, content excised for length and marketability to an American audience of the time. The original was destroyed by the Third Reich when Fritz Lang refused to make propaganda films for them and fled to America. This book, written by Lang's wife, is the closest we have to seeing the full version.
I recommend the print version put out about 20 years ago with gorgeous illustrations by Wm. Michael Kaluta, a marvelous artist with a fine fix on the Art Deco aesthetic, who is best known in comic circles as an artist on latter day versions of The Shadow. Those visuals will complete the experience of watching a lost cut of the original.