Agent Lam (Tony Leung) sets out to track a pair of plates used to make fake American dollars. When he discovers the plates, they are conned out of him by enigmatic US Embassy workers Owen (Richie Ren) and JJ (Shu Qi). With the trail now leading to Korea, Lam sets off in hot pursuit. There, amidst the dangerous and glamorous urban landscape of Seoul, Lam finds himself confronting an underworld crime boss known as the Polar Bear, head of the biggest counterfeiting organisation in Asia.

Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.

Three young martial arts masters emerge from the back streets of Hong Kong to help the powerless fight injustice.

Gillian and Charlene, as usual, play a couple of mis-matched partners who come under the tutelage of the slightly nutty and love-sick Black Rose, a former kung fu-fighting super-hero who grooms them for a life of fighting crime. Ekin Cheng plays a dim-witted cab driver who wears a Robin costume and becomes Charlene's love interest. There is a bit of "comedy" as Rose confuses Ekin with her former lover and Gillian become jealous. A lot of time is wasted with this Three's Company-style shtick until eventually, some shred of a conflict comes forward, as the girls must battle a former protege of Rose who has taken to kidnapping to pay the bills.

In the macho triad world where heroes are molded from blood, brawn and brains, what place is there for a defenseless girl? The only exception to the rule is if you earn your respect as 'Ah Sou' - the big boss' wife. Ah Sou tells the extraordinary story of an innocent girl who becomes appointed successor to Hong Kong's ruling triad. This role becomes a double-edged sword for our young heroine, who is sucked into a maelstrom of vicious gang wars, hair-raising assassination attempts and ruthless power struggles and betrayals. Through numerous violent episodes and unexpected reversals, she discovers her own inner strength and re-writes the laws of the triad kingdom.

Ekin Cheng plays Autumn Yip, a triad mobster who gets caught in Thailand and does 8 years in prison before being released. He visits "The Doctor" and asks for a loan before returning to Hong Kong where he is eagerly awaited by his old triad business partners as well as the Hong Kong police who have set up a special 'anti-Triad' unit just to keep tabs on Yip. The movie shows the confusion shown by the mob and the police over Yip's sudden philanthropy as he makes headline after headline for doing good deeds, not bad. This does not sit well with his old triad boss Brother Hung (Ti Lung) nor Hung's son, Gwai Chai (Stephen Fung). Gwai Chai in particular is itching to rise the ranks of the mob and take over and sets up deals on his own which increasingly puts pressure on himself to deliver. The mob's success hinges on Yip's connections to Thailand and Gwai Chai takes matters to the extreme in order to force his deal to be a success...