Detective Investigation Files IV poster
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Detective Investigation Files IV

8.01 seasonTV SeriesDramaCrimeMystery

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…

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Seasons & Episodes

E1
Episode 1
Mar 29, 1999
E2
Episode 2
Mar 30, 1999
E3
Episode 3
Apr 5, 1999
E4
Episode 4
Apr 1, 1999
E5
Episode 5
Apr 2, 1999
E6
Episode 6
Apr 3, 1999
E7
Episode 7
Apr 6, 1999
E8
Episode 8
Apr 7, 1999
E9
Episode 9
Apr 8, 1999
E10
Episode 10
Apr 9, 1999
E11
Episode 11
Apr 10, 1999
E12
Episode 12
Apr 12, 1999
E13
Episode 13
Apr 13, 1999
E14
Episode 14
Apr 14, 1999
E15
Episode 15
Apr 15, 1999
E16
Episode 16
Apr 16, 1999
E17
Episode 17
Apr 17, 1999
E18
Episode 18
Apr 19, 1999
E19
Episode 19
Apr 20, 1999
E20
Episode 20
Apr 21, 1999
E21
Episode 21
Apr 22, 1999
E22
Episode 22
Apr 23, 1999
E23
Episode 23
Apr 24, 1999
E24
Episode 24
Apr 26, 1999
E25
Episode 25
Apr 27, 1999
E26
Episode 26
Apr 28, 1999
E27
Episode 27
Apr 29, 1999
E28
Episode 28
Apr 30, 1999
E29
Episode 29
May 1, 1999
E30
Episode 30
May 3, 1999
E31
Episode 31
May 4, 1999
E32
Episode 32
May 5, 1999
E33
Episode 33
May 6, 1999
E34
Episode 34
May 7, 1999
E35
Episode 35
May 8, 1999
E36
Episode 36
May 10, 1999
E37
Episode 37
May 11, 1999
E38
Episode 38
May 12, 1999
E39
Episode 39
May 13, 1999
E40
Episode 40
May 14, 1999
E41
Episode 41
May 15, 1999
E42
Episode 42
May 17, 1999
E43
Episode 43
May 18, 1999
E44
Episode 44
May 19, 1999
E45
Episode 45
May 20, 1999
E46
Episode 46
May 21, 1999
E47
Episode 47
May 22, 1999
E48
Episode 48
May 24, 1999
E49
Episode 49
May 25, 1999
E50
Episode 50
May 26, 1999

Cast

LKLouis Koo
Louis Koo
徐飞
JHJessica Hsuan Huen
Jessica Hsuan Huen
武俏君
SKSunny Chan Kam-Hung
Sunny Chan Kam-Hung
江子山
CSCharmaine Sheh Sze-Man
Charmaine Sheh Sze-Man
文婉兰
LSLee San-San
Lee San-San
唐心如 Tong Sum Yu
SLSafina Lam
Safina Lam

More from Louis Koo · Lead actor

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1995 · 8.1
At the Threshold of an Era
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1999 · 8.2
Burning Flame
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1998 · 8.7
Happy Harmony
Happy Harmony
1994
A Step Into The Past
A Step Into The Past
2001 · 7.7
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Warriors of Future
2022 · 7.0
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The Condor Heroes 95
1995 · 7.3
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1996 · 7.0
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2024 · 7.0
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1997
See all fromLouis Koo

More from Jessica Hsuan Huen · Co-star actress

Detective Investigation Files
Detective Investigation Files
1995 · 8.1
Armed Reaction
Armed Reaction
1998 · 8.2
The File Of Justice
The File Of Justice
1992 · 8.0
Burning Flame
Burning Flame
1998 · 8.7
Happy Harmony
Happy Harmony
1994
Line Walker
Line Walker
2014 · 7.8
ICAC Investigators
ICAC Investigators
1992 · 7.0
A Step Into The Past
A Step Into The Past
2001 · 7.7
Dicey Business
Dicey Business
2006 · 8.7
Witness to a Prosecution
Witness to a Prosecution
1999 · 8.3
See all fromJessica Hsuan Huen

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1995 · 8.1
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1973 · 7.0
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1958 · 7.2
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2025 · 6.2
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2021 · 6.5
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Detective Investigation Files IV — streaming FAQ

Which OTT platform streams Detective Investigation Files IV?

Detective Investigation Files IV isn't streaming anywhere in United States yet.

Is Detective Investigation Files IV on Netflix?

No, Detective Investigation Files IV is not on Netflix in United States as of October 2026.

Is Detective Investigation Files IV on Amazon Prime Video?

No, Detective Investigation Files IV isn't on Amazon Prime Video in United States right now.

Where can I watch Detective Investigation Files IV for free?

Detective Investigation Files IV isn't streaming in United States yet, so there's no way to watch it free at the moment.

How many seasons are in Detective Investigation Files IV?

Detective Investigation Files IV has 1 season in total (50 episodes). The series concluded in 1999.

Are all episodes of Detective Investigation Files IV out yet?

Yes — all 50 episodes across 1 season of Detective Investigation Files IV are out and available to stream.

Is there a Season 2 of Detective Investigation Files IV?

No — Detective Investigation Files IV ended after 1 season, so there is no Season 2.