Eager to bring down the criminal cartel controlling China's drug trade, a veteran police detective thinks he's caught a break when a dealer in custody agrees to turn informant. With the dealer's help, the lawman works his way into the trafficking operation...but will his trust in his snitch lead to a deadly betrayal? Director Johnnie To's intense crime drama stars Sun Honglei, Louis Koo, Michelle Ye. 107 min. Widescreen (Enhanced); Soundtracks: Chinese Dolby Digital 5.1, Dolby Digital stereo; Subtitles: English. In Chinese with English subtitles.