In the Line of Duty 4
皇家師姐IV直擊證人
Watch 'In the Line of Duty 4' Online Free HD at Vumoo. Two detectives who are up to their necks in trouble and in each other's face, as they try to shut down a drug-trafficking scheme that could be connected with international ties to organized crime. But in the midst of their investigation, innocent immigrant dock worker Luk Wan-Ting gets caught up in the mix when he witnesses the murder of an intelligence operative and is framed for the crime.