Top-notch commercial filmmaking starring more big names than any Hong Kong film probably deserves.

The HK cops-and-robbers thriller Infernal Affairs, movie that spent 55 million Hong Kong dollars to produce, and become the territory's second highest-grossing local film. Cries of "Box Office Miracle" were trumpeted by Hong Kong's so-called fourth estate, which advanced the opinion that Hong Kong Cinema was revived. Still, it would be preferable if a box-office revival came with an actual good motion picture.

Tony Leung Chiu-Wai stars as Yan, a police mole in the triads for the past ten years. He's been deep, deep undercover for so long that he's started to question his focus and sanity. Meanwhile, he has a mirror opposite on the other side. Andy Lau is Ming, a rising cop who's secretly a triad mole. For the same ten years, he's been feeding information to Sam (Eric Tsang), a ruthless triad kingpin who Yan currently works for.

Sam's archenemy is Organized Crime and Triad Bureau Inspector Wong (Anthony Wong), who's Yan's only link to the police force. On a routine drug bust, both sides discover the presence of a mole within their ranks, and both sides charge their respective undercover with finding the offending party. However, Ming's exact loyalties are not entirely clear, which may mean problems for both Sam and Inspector Wong. Meanwhile, Yan tries not to be killed by either side.
On killer's side concept, there's really nothing ultra new about Infernal Affairs. The mirror-image cop/criminal thing has been done to death in everything from Running Out of Time to Face/Off, and Infernal Affairs doesn't really get out from beneath that. The concept of opposing moles adds an extra layer, but it's still nothing more than a minor tweak to genre convention. The weak female roles Kelly Chen appears as Dr. Lee, Yan's appointed psychiatrist and probably the greatest-looking health practitioner

Conversely, the character of Ming's girlfriend Mary is underused. As played by Sammi Cheng, she's an overly spritely novelist who spouts metaphorical dialogue as if there were no tomorrow. Unfortunately, the filmmakers don't use her character to further flesh out Ming. Ming is a bad guy who wants to be a good guy, but our only real clue to this is his apparent reticence when he first enrolls in the police academy. The young Ming is played fittingly by Edison Chen, who shines in roles requiring only three lines of dialogue and no wannabe gangster posturing. When Chen is onscreen, we see that Ming wants no part of the undercover life; but when Andy Lau takes over, his objections to the life of a mole seem external: big promotions, new apartment, bubbly girlfriend. If he's outed as a triad mole then he loses those things—a prime motivation for wanting to be good. Those things aren't properly explored; sometimes, it seems that he simply is tired of being controlled by Sam.

What it all comes down to is "why." Yan wants to ditch the undercover life because he's tired of living in darkness. Ming wants to get out for seemingly selfish reasons, but is that entirely true? The moral murkiness that's offered up makes Ming seem only self-involved, and not really a mixture of good or evil. Andy Lau does a fine job with the character, and even brings a sinister quality to the proceedings. Then again, it would have been nice to have some confirmation of what exactly was going on with Ming. The character work in Infernal Affairs has been lauded by a variety of critics. It happens to be excellent genre work, but no new ground is truly covered, and in Ming's case potential was wasted.

What Infernal Affairs gets absolutely right is the thrill of the chase. There are some contrivances along the way, but the mounting chase between the two leading characters creates gripping cinematic tension. Likewise, the fates of certain characters are affecting, and some of the plot twists are genuinely compelling.

This may be the most fittingly shot film of the year, with the dark, cool colors of the triad underworld contrasting with the stark, bright beauty of Hong Kong's daytime cityscape. A lot of this stuff is award material; expect to see Hong Kong Film Award nominations for many of the participants involved.