| Detective Investigation Files IV | |
|---|---|
.jpg) Detective Investigation Files IV Poster | |
| 刑事偵緝檔案IV | |
| Genre | Modern Drama |
| Starring | Louis Koo Sunny Chan Jessica Hsuan Charmaine Sheh Lee San San |
| Opening theme | "萬里陽光" ("10,000 Miles of Sunshine") by Edmond Leung |
| Ending theme | "宇宙無限" ("Universe Unlimited") by Edmond Leung & Louis Koo |
| Country of origin | Hong Kong |
| Original language | Cantonese |
| No. of episodes | 50 |
| Production | |
| Producer | Poon Ka Tak |
| Running time | approx. 45 minutes |
| Original release | |
| Network | Television Broadcasts Limited |
| Release | March 29 – June 4, 1999 |
| Related | |
| Infobox instructions (only shown in preview) | |
Detective Investigation Files IV (Chinese: 刑事偵緝檔案IV) is the 4th and final installment of the Detective Investigation Files TV franchised by TVB in Hong Kong. It won two TVB Anniversary Awards, including Best Actor for Louis Koo and Best Actress for Jessica Hsuan.
The series focuses on the lives of two detectives, Tsui Fei (Louis Koo) and Kong Chi Shan (Sunny Chan), and the murder cases they deal with.