I viewed it a second or third time recently. This was a picture about a Los Angeles, California, detective uncovering a major political scandal. Released in 1974, this film won an Academy Award for Robert Townes screenplay. Director Roman Polanski re-created the look and mood of 1930s detective movies in this complicated crime drama. Jack Nicholson portrays a detective who is hired to investigate an extramarital affair but stumbles upon a series of larger crimes, including political corruption, incest, and murder. As the mystery unravels, new layers of complication present themselves and Nicholsons character becomes more perplexed. An aura of uncertainty permeates the whole film, and even the final lineCome on Jake, its Chinatown,which suggests that some situations are too complex to fully understand. (parts of answer from a review) But all the same a fascinating film.