The police department has long been untouchable until tonight when hijackers kidnap 5 highly trained officers. Cryptic messages from the hijackers expose a mole within the task force.
Lung (Nick Cheung), a hardworking property agent, is facing a serious situation in life. His girlfriend won't marry him unless he can buy her a 1000-sq ft. apartment in one year's time; whilst Charlotte (Sammi Cheng) desperately needs a place to stay after her divorce. Along with Lung's intern Very (Oho), a mainland richling, they become co-owners of the office girl Hak's (Angelababy) small flat that was left to Hak by her estranged mother.
International Security Affairs agent Jon is on a dangerous mission to escort a criminal scientist to another country. En route, a member of his team, Sean, turns out to be a traitor and shoots Jon in the head while kidnapping the scientist. When Jon wakes up in the hospital, a doctor tells him that within weeks, the bullet in his brain will cause complete paralysis. Jon returns to Beijing to see his mother, who confesses that Jon has a brother in Malaysia who was raised by his father, a gambler. Jon takes a flight to Malaysia to find his brother, Yeung. On the plane he forms a bond with Dr. Kan, who promises to look into possible treatments for his condition. However, when they arrive, Yeung tries to kidnap the doctor and when Jon intervenes, he's also taken hostage. The two soon realize they're brothers, and decide to work together in order to keep the criminals behind the kidnappings from reinfecting the world of a disease long thought cured.
Emotionless has left Six Doors, as has Cold Blood, who has decided to investigate the death of Lord Bu on his own. The departure of two of the four constables has effectively left Six Doors defunct. At this time, trouble begins to brew in the Imperial Palace as Emperor Huizong plans to travel incognito to the outside world. When he is almost assassinated and subsequently disappears, Cold Blood, Emotionless, Iron Hands and Life Snatcher must band together once again under Master Zhuge to save the empire from a massive conspiracy.
In the 1970s, the Hong Kong government enacted a policy that granted each male heir of New Territories villagers the privilege to build a house without paying any dues to the government. Since then, those grants have become a commodity that village leaders can profit from.
During World War II era, a young woman, Wang Jiazhi, gets swept up in a dangerous game of emotional intrigue with a powerful political figure, Mr. Yee.
