This is Hong Kong action at its finest â€“ cool, precise and deadly. With Hollywood action maestro Yuen Wo-ping (The Matrix, Crouching Tiger, Hidden Dragon) behind the cameras, audiences can expect no less. Touted as one of the best Hong Kong cop films of all time, In The Line Of Duty delivers breath-taking action with immaculate choreography and flawless execution by its stars Donnie Yen (Blade 2, Iron Monkey) and Cynthia Khan as two cops from both sides of the Pacific on the trail of a drug trafficking syndicate. Khan and Yen discover to their dismay that the syndicate has more than one insider working in the law enforcement agencies. As they break the rules to save a witness, the two find themselves pursued by American assassins, Hong Kong gangs and the law.In The Line Of Duty 4 scores a 10 out of 10 for action and equally as much for the outstanding performances of its cast.