An award-winning crime thriller in the intense tradition of Heat and Reservoir Dogs...critics everywhere have hailed Infernal Affairs for its gritty action and international superstars. Chan Wing Yan (Tony Leung - Hero) is a hard-nosed veteran cop sent undercover to infiltrate the notorious Triad crime ring. An expert at bringing down violent syndicates, Chan thinks it's going to be a routine mission. What he's not prepared for is the discovery that the Triad's boss (Eric Tsang - The Accidental Spy) has planted a mole (Andy Lau - The Legend Of Drunken Master) in the police department...and now Chan is being hunted down. In this battle of wills, only one cop can win!