Want to watch "Detective Investigation Files IV" from your couch, bed, or on your commute? Tracking down a streaming service to buy, rent, download, or binge the crime TV series via subscription can be tricky, so we here at Moviefone want to do the heavy lifting.
Read on for a listing of streaming and cable services – including rental, purchase, and subscription alternatives – along with the availability of "Detective Investigation Files IV" on each platform. Now, before we get into the nitty-gritty of how you can watch "Detective Investigation Files IV" right now, here are some specifics about the show.
Originally premiering July 12th, 2025, "Detective Investigation Files IV" stars Louis Koo, Jessica Hester Hsuan, Sunny Chan Kam-Hung, Charmaine Sheh Sze-Man. The series runs 1 season(s), and has a score of 80 (out of 100) on TMDB, which collated reviews from 1 knowledgeable people.
Curious to know what the TV series is about? Here’s the plot: "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 is a complete reboot of the series, with new cast. 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."
"Detective Investigation Files IV" is currently available to stream via subscription, rental, or purchase on .
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