Told almost exclusively from the perspective of prosecutor "Vincent Bugliosi" (George DiCenzo) this movie details the events that occurred on August 9, 1969 (and again on the next day) by Charles Manson and his followers along with their subsequent arrest, trial and conviction for the murders of seven people in Hollywood, California. Even today the entire story is both shocking and bizarre. Now rather than reveal any more of this movie and risk spoiling it for those who haven't seen it I will just say that although it is told in a documentary style it still manages to retain the horror of the events to a great degree. I especially liked the performance of Steve Railsback (as "Charles Manson") who performed in a very excellent manner. Likewise, Nancy Wolfe (as "Susan Atknins") was also very good. At any rate, there are apparently several versions of this movie available and since I have only seen the long version (about 194 minutes) I can only say that this particular version is very good and I rate it as above average.
Review of Helter Skelter
