The sequel to Chinatown (1974) finds J.J. "Jake" Gittes investigating adultery and murder, and the money that comes from oil.
 
This movie should have never been made.
 
FUN FACT:  The film was humiliated nationally after an incident at a movie theater in Florida where a patron was watching it and left his seat to tell the theater manager that the reels of the movie were running out of sequence. The manager went to check and confirmed this, but then told the moviegoer "this movie's been playing here for 3 weeks and you're the first person who noticed that something was wrong."