![](https://www.themoviedb.org/t/p/w1920_and_h800_multi_faces//qIhpdUMyBTD8QijBKSz2uBOvH00.jpg)
![](https://image.tmdb.org/t/p/w600_and_h900_bestv2/w3IqNotgwl8RRS17P50xCOB9EEB.jpg)
In the Line of Duty 4 (1990)
- 18
- 12/21/1990 (DE)
- Adventure, Action
- 1h 34m
Overview
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.
Yuen Woo-ping
DirectorCheung Chi-Sing
WriterAnthony Wong Wing-Fai
WriterStephen Shin
WriterKim Yip Kwong-Kim
WriterCast
![Cynthia Khan's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/idcO9jXOyTZTz6bqnTLAynsHq4T.jpg)
Cynthia Khan
Insp Rachel Yeung Lai-Ching![Donnie Yen's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/hTlhrrZMj8hZVvD17j4KyAFWBHc.jpg)
Donnie Yen
Captain Donnie Yan![Michael Wong's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/k3iH4zPZ8faWEF5uJeiq7fTtg7p.jpg)
Michael Wong
Captain Michael Wong![Yuen Yat-Choh's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/45g23jL9uKrublSZ4SKtGG0S9oi.jpg)
Yuen Yat-Choh
Luk Wan-Ting![Lisa Chiao Chiao's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/nRUOdSjupvQIwIHukAWPTrXB1cj.jpg)
Lisa Chiao Chiao
Luk's Mother![Wai Gei-Shun's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/lEgXSqE2QE1k8FCemdr4DDRVck9.jpg)
Wai Gei-Shun
HK Police Officer![Yuen Shun-Yi's headshot](https://image.tmdb.org/t/p/w600_and_h900_bestv2/3DLtcPAMGnexk0GifXo1UVRmatX.jpg)