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.
Is In the Line of Duty 4 on Netflix? Unfortunately the movie In the Line of Duty 4 is not yet available on Netflix. Follow us on Facebook to see when In the Line of Duty 4 becomes available on Netflix!
| Crew | Yuen Shun-Yi | Martial Arts Choreographer |
| Crew | Yuen Woo-Ping | Martial Arts Choreographer |
| Directing | Yuen Woo-Ping | Director |
| Writing | Cheung Chi-Sing | Writer |
| Crew | Cho Wing | Martial Arts Choreographer |
| Crew | Paul Wong Kwan | Martial Arts Choreographer |
| Writing | Anthony Wong Wing-Fai | Writer |
| Writing | Stephen Shin | Writer |
| Writing | Kim Yip Kwong-Kim | Writer |
| Production | Dickson Poon Dik-Sang | Executive Producer |
| Production | Stephen Shin | Producer |
