Ah Chaan and Fat Chug were good partners in the Police Force. Both of them had helped in solving many criminal and civil cases despite their silly behaviour. In order to persuade Ah Fong to marry him, he provide a living space for Ah Fong's aunt and her daughter named Ah Jane. Ah Chaan was attracted by Jane’s charm and lovely personality and tried everything to please her. A dominant criminal had made a plot were chased by the police. Joe, who was the criminal's assistant catch Jane and Fong and threatened that she would not release Ah Jane and Fong if both Ah Chaan and Fat Chug did not get the ransom for them. The gangster put on them a remote time bomb and a microphone to have a better control on them...
Unfortunately the movie Modern Detective is not yet available on HBO Max.
| Writing | Lo Lieh | Screenplay |
| Directing | Lo Lieh | Director |
| Sound | Frankie Chan Fan-Kei | Original Music Composer |
| Production | Lo Wei | Producer |
| Crew | Hsu Li-Hwa | Presenter |
| Camera | Liang Hsi Ming | Director of Photography |
| Editing | Tony Chow Kwok-Chung | Editor |
| Lighting | Lin Chiu | Lighting Technician |
