Chinatown (1974)8.2 /10

Storyline:  When a private detective is hired to investigate a simple case of infidelity, he ends up discovering a huge secret network of corruption perpetrated by high-profile businesspeople, politicians and policemen. This is considered one of the best screenplays of all time, a haunting and disturbing story about how greed turns into corruption in a system which values power and money over individuals.