One's an undercover cop inside a Triad, the other is a undercover Triad inside the police force. Which one will expose the other first? Riveting drama throughout. Included in the package is a top-notch cast at the peak of their powers and expert direction. Did I mention this is also an allegory for a Buddhist hell? (If you don't know what hell is, just take a look at the surviving character at the end of the movie and you'll have a fairly good concept) Just when you think a genre has been done to death, something like this takes you by surprise. This is a must see film for anyone interested in delving much deeper than standard cop versus crook fair.
Review of Infernal Affairs
