Mystery Files is a 1997 Hong Kong science fiction thriller television series produced by TVB and stars Gallen Lo as a biochemist who advocates scientific methods to refute superstitious theories, utilizing scientific theories to uncover the answers to a series of strange events.

Peter Ko (Gallen Lo) is a university biochemistry professor who is calm and believes in science while opposes superstition.

Carrie Man (Maggie Cheung) is a researcher and screenwriter for documentary programmes at a television station who has witnessed a series of strange events.

Law's daughter, Pui-ling (Winnie Yeung), recently returned to Hong Kong gives a statue to her father as a gift.

Chau-ping and Carrie interviews Sister Heung about her experience, while Peter also appears in the television program to give an explanation from a scientific point of view.

When Pui-ling decides to return to Los Angeles, she gives the statue to Peter, who analyzes it with his friends and discovers many channels in it.

One time while buying midnight snacks, Chi-yan ran into two punks, Wong Yik-sing (Yu Lok-fai) and Chan Sai-wing (Law Cho-ho).

Yik-sing and Sai-wing were then murdered and Chi-yan's boyfriend, Lai Ka-leung (Ruco Chan) becomes the primary suspect.

Victor was later involved in a car accident, which lead him to see flashing footage in his brain where a jewelry shop employee being killed and Cheuk-nam being shot.

A real robbery occurs where Cheuk-nam was unharmed but the robbers, Chan Po (Pal Sinn) and Fung (Celine Ma) escapes.

Victor's personality changes and his mother, Fong (Lily Li), goes to Peter for help as she suspects that his son is possessed by his older twin brother.

Peter suspects Victor's twin brother is still alive and Carrie makes a call to Dongguan to confirm the matter.

Victor goes to a nightclub and kills Po's underling, Kwai (Lee Ka-keung), and afterwards, goes to the villa to attack Fung.

Peter later sees an advertisement of a girl named Fung Suk-yan (Kan Pui-kwan) searching for Cheung Wai (Hawick Lau), although the two of them have died 20 years old in a traffic accident.

One day, Peter and Carrie bump into Cheng Nga-yee (Josie Ho), a girl who claims to be the reincarnation of Suk-yee.

On the day of the wedding, Dennis receives a mysterious box and dies as his brain tissues erodes, leaving his wife, Ling (Chung Kit-yee), heartbroken.

Pauline's cousin, Ray, examines Cheuk-nam's body and discovers hook worms inside that can not be cured for the moment.

Chi (Damon Law), son of Pak-king's friend, Piu (Chan Chung-kin), joins the church and refuses to come home afterwards.

Peter and Carrie bring a camera team to intervene its priest, Chan Lap-man (Cheng Pak-lun).

Benny later meets a girl named Fong at a bar and makes out with her, but the next day, he finds her dead with her heart taken out.

Cheuk-nam investigates the case and a bartender informs him that Benny left with Fong the other night but refuses to admit so.

Benny then follows her and sees Karen and Chan taking out the heart of a woman who had a sexual relationship with the man at the bar.

Fortunately, Peter was able to prevent Benny and Carrie from drinking it, and Cheuk-nam eventually brings his squad to the rescue.

Peter's ex-girlfriend, Vicky (Claudia Lau), returns to Hong Kong who is upset when she finds out he is dating Carrie.

After Vicky's mother died, her longtime pen pal Uncle Chan introduces her to Hong Kong to work at Chu's Corporation.

Chak-sing's three children, Yiu-chung (Mak Ka-lun), Yiu-cho (Au Siu-wai) and Yee-ting (Lam Pui-kwan), and their mother, Ting Yung (Mannor Chan), views Vicky as their enemy.

When Chak-sing dies, he gives a majority of the stocks of Chu's Corporation to Vicky and Kin-hoi assists her in managing the company.

Peter's father, Chi-wing, encounters a ship accident and when he made it to Hong Kong, he was knocked down by a car.

Carrie's colleague, Kwai (Willie Wai), has mental issues and often waits for her outside of the television station after work.

When Peter and Carrie visits Chi-wing at the hospital, they find him missing leaving a note stating he came to the wrong space-time.