# Detective Investigation Files III

Detective Investigation Files III is a 1997 TVB production. It was a direct sequel to Detective Investigation Files II and the third installment in the Detective Investigation Files Series. The series ran for 40 episodes. Only Michael Tao, Joey Leung and Kenix Kwok returned to reprise their roles from the previous two installments. Louisa So, Amy Kwok, Joseph Lee and Sammi Cheng did not participate in this series; instead they were replaced by Margaret Chung, Law Koon Lan, Liu Kai-chi, Monica Chan and Winnie Yeung who portrayed new characters. This installment featured 10 cases.

## Cast
### Main cast

| Actor | Role | Description |
| Michael Tao | Cheung Tai Yung (張大勇) | 張Sir、勇哥、大勇 Inspector Detective Jessie's husband Lee Chung Yi's best friend Pak Yan Tung's ex-boyfriend |
| Kenix Kwok | Ko Chit (高婕) | Jessie、「細妹」 reporter Cheung Tai Yung's wife Deborah's niece |
| Joey Leung | Lee Chung Yi (李忠義) | 義仔、師兄 Sergeant Detective Cheung Tai Yung's best friend and subordinate Sasa's ex-boyfriend Lee Sze Lung's boyfriend |
| Margaret Chung | Lee Sze Lung (李思龍) | 「o靚妹」 Constable Detective Cheung Tai Yung's subordinate Lee Chung Yi's girlfriend Harvey's best friend Former girl guide |
| Liu Kai-chi | Chak Wing Tin (翟永田) | 田哥 Experienced Sergeant Cheung Dai Yung's subordinate Deborah's lover, later husband Grievously hurt by Johnson in episode 38 |
| Monica Chan | Pak Yan Tung (柏恩桐) | Ex insurance manager restaurant manager Cheung Tai Yung's classmate and ex-girlfriend Poisoned to death by Johnson in episode 37 |
| Law Koon Lan | Chu Sau Kwan (朱秀筠) | Deborah、筠姐 Jessie's aunt Chak Wing Tin's ex lover, later wife Johnson's ex-girlfriend |
| Winnie Yeung | Szeto Sasa (司徒莎莎) | Lee Chung Yi's ex-girlfriend Former girl guide Appeared in episode 14 Left Hong Kong in episode 40 |

## Cases
### Case 1: The Other Jessie (Episode 1–5)

| Actor | Role | Description |
| Patrick Tam | Ho Chi Wan (何志宏) | Stephen、何醫生 Doctor Ning Qian Hua's boyfriend Murdered Tony and tried to murder Jessie Sentenced to death in episode 5 (Villain) |
| Kenix Kwok | Ko Chit (高婕) | See Main Cast |
| Kenix Kwok | Ning Qianhua (寧倩華) | Vivian、阿倩 Originally from Guangzhou Ho Chi Wan's girlfriend Switched identities with Jessie and escaped to Hong Kong Sentenced to death in episode 5 (Semi-Villain) |
| Eric Li | Law To Fung (羅道風) | Tony、羅醫生 Doctor Ho Chi Wan's friend Murdered by Ho Chi Wan in Beijing in episode 1 |
| Leung Kin Ping | Wang Haosheng (王浩生) | Blackmailed Gary Shek and Ning Qianhua Murdered by Ning Qianhua in Beijing in episode 1 (Villain) |
| Lan Tianying | Lan Qing (藍青) | Blackmail Gary Shek with Wang Haosheng Arrested in episode 2 (Villain) |
| Emotion Cheung | Gary Shek (石少維) | Blackmailed by Wang Haosheng and Lan Qing in Beijing |
| Wu Suqin | Fu Zhaohong (伏照紅) | Cheung Tai Yung's friend Qiao Jin's mother |
| Tu Ling | Jiang Yang (姜楊) | 楊楊 Qiao Jin's wife |
| Ronnie Ching | Qiao Jin (喬進) | Cheung Tai Yung's friend Fu Zhaohong's son Beijing's Gong An(Police) |
| Lu Wanfen | Ding Miao (丁苗) | 小苗 Beijing's Gong An(Police) |
| Shen Xingming | Zhu Jin (朱謹) | 小朱 Beijing's Gong An(Police) |
| Zheng Ruixiao | Chai Jun (柴軍) | 小柴 Beijing's Gong An(Police) |
| Melissa Ng | Yu Xiaoyu (于小愉) | Ko Chit's Lawyer |
| Wong Tai-wai | Zheng Guoping (鄭國平) | Mainland Lawyer |

### Case 2: Rape and Revenge (Episode 6–9)

| Actor | Role | Description |
| Karen Tong | Cheng So Sam (鄭素心) | Lui Sai Ho's wife Lui Chin Mei's mother Deceased |
| Karen Tong | Lui Chin Mei (呂展媚) | Lui Sai Ho's step daughter Raped by Lui Sai Ho Killed Lui Sai Ho in episode 6 Committed suicide in episode 9 (Villain) |
| Lau Kong | Lui Sai Ho (呂世豪) | Lai Chin Mei's step father Raped Lui Chin Mei Killed by Lui Chin Mei in episode 6 (Villain) |

### Case 3: Unexpected Murderer (Episode 10–12)

| Actor | Role | Description |
| Lisa Lui | Yu Bik Ling (余碧玲) | 玲姐 Famous chef Deborah's rival Killed by Sham Yeuk Mui |
| Strawberry Yeung | Shum Yeuk Mui (沈若玫) | Chef Killed Yu Bik Ling Arrested in episode 12 (Villain) |

### Case 4: Love-hate Struggle (Episode 13–15)

| Actor | Role | Description |
| Monica Chan | Pak Yan Tung | See#Main Cast |
| Derek Kok | Hui Wai Lin | William musician Pak Yan Tung's ex-husband Killed Choi Chi Kim in self-defense in episode 13 Died in accident in episode 15 (Villain) |
| Edward Mok | Choi Chi Kim | Killed by William in episode 13 (Villain) |

### Case 5: Butterfly Triggers (Episode 16–18)

| Actor | Role | Description |
| Timmy Ho | Ching Sau Mong | 大B哥哥 Sasa's childhood friend Tried to cover Ching Sau On's murder |
| Lee Hung Kit | Ching Sau On | 大Dee Ching Sau Mong's older brother Killed Jim Chui Yi Mental patient Killed by both Wu Kin and Chan Tai in episode 19 |
| Irene Wong | Jim Chui Yi | Johnson's daughter Killed by Ching Sau on in episode 17 |

### Case 6: A Furious Affair (Episode 19–23)

| Actor | Role | Description |
| Henry Lee | Chung Man Hoi | Jessie's boss Killed Harvey, Stella and tried to kill Mak Ho Hing Arrested in episode 23 (Villain) |
| May Kwong | Mak Ho Hing | Florist Chung Man Hoi's mistress and partner in crime Died in episode 23 (Villain) |
| Gabriel Harrison | Cheung Yat Fei | Harvey photographer Cheung Tai Yung's half younger brother Stella's ex-boyfriend Killed by Chung Man Hoi |
| Kan Pui Kwan | Mok Wing Hei | Stella Mok、鍾太 Chung Man Hoi's wife Harvey's ex-girlfriend Raped by Yip Wei and gave birth to son, suspected to be Harvey's son Killed by Chung Man Hoi |

### Case 7: Now You See Me, Now You Don't (Episode 24–27)

| Actor | Role | Description |
| Albert Law | Ting Hon Cheung | Hui Chau Yi's husband Kidnapper Shot and killed by Johnson in episode 27 (Villain) |
| Cecilia Fong | Hui Chau Yi | Ting Hon Cheung's wife |

### Case 8: The Charlatan Murders (Episode 28–31)

| Actor | Role | Description |
| Choi Kok Hing | Wan Ko Tin | Charlatan Pak Yan Tung's paternal grandfather Stabbed to death by Tam Chi Long |
| Chin Kar Lok | Cho Heung Tung | 向東表哥、表少教師 Pak Yan Tung's cousin Manipulated Tam Chi Long to commit the murders Finally inherited all the assets from Wan's family (Villain) |
| Joe Ma | Tam Chi Long | Doctor Killed Wan Ko Tin, arrested in episode 31 (Villain) |

### Case 9: The Precious Stone (Episode 32–37)

| Actor | Role | Description |
| Law Lok Lam | Fong Sung Yip | Lee Sze Lung's father Sasa's boss Vietnam War veteran Killed by Chiang Yiu |
| Eileen Yeow | Fong Nim Ching | Fong Sung Yip's youngest daughter Lee Sze Lung's younger sister Chiu King Seng's wife |
| Wong Kai Tak | Chiu King Seng | 成哥（28歲） Fong Sung Yip's son-in-law, Fong Nim Ching's husband Ho Siu Lai's lover Killed Chiang Yiu Arrested in episode 37 (Villain) |
| Angela Tong | Ho Siu Lai | Erica Chiu King Seng's lover Abetted Chiu King Seng in the murders (Villain) |
| Iwanbeo Leung | Chiang Yiu | Sculptor Lesbian Fong Sung Yip's fiance Killed Fong Sung Yip Killed by Chiu King Seng (Semi-villain) |

### Case 10: Backstage Manipulator (Episode 37–40)

| Actor | Role | Description |
| Kam Hing Yin | Jim Pak Hung (Johnson) | 詹Sir Chief Inspector Jim Chui Yi's father Manipulated the events of Case 5, 7 and 9 Arrested in episode 40 (Main Villain) |
| Wilson Tsui | Wu Kin | Chak Wing Tin's good friend Killed Ching Sau On Kidnapped Fong Sung Yip and Lee Sze Lung Conspired with Chan Tai to extort Johnson Stabbed to death by Johnson (Villain) |
| Yau Man Seng | Chan Tai | Wu Kin's partner in crime Killed Ching Sau On Kidnapped Fong Sung Yip and Lee Sze Lung Conspired with Wu Kin to extort Johnson Shot and killed by Johnson (Villain) |
| Celine Ma | Helen | Wu Kin's girlfriend Shot and killed in the back by Johnson |
| Monica Chan | Pak Yan Tung | Cheung Tai Yung's classmate and ex-girlfriend Poisoned to death by Johnson |
| Simon Sit | Sun Keng Do | Village tramp and witnessed Johnson's crimes Fell to death after being pushed by Johnson |
| Chiu Shek Man | Chou Sir | 周Sir Superintendent Johnson's superior Accidentally poisoned to death by Johnson |
| Liu Kai-chi | Chak Wing Tin (翟永田) | 田哥 Cheung Dai Yung's subordinate Deborah's lover, later husband Grievously hurt by Johnson in episode 38 |