Seeking to find another line of work, Lee attempts to join Wong's detective agency.

Later, they were also hired by a supermarket owner to foil an upcoming shoplifting case which leads to a scene where Lee puts his kung fu skills in use to fight thugs.

The most important part of the film is when a gang of robbers led by Uncle Nine (Shih Kien) who demands ransom from a cinema mogul.

He then leads his gang to extort movie goers and Wong is one of them, who struggles against Uncle Nine in the mayhem, injuring his leg in the process.

Like The Private Eyes, their exploits throughout the film resulted in investigation on celebrity scandals and their unfortunate situation involving the trio and a group of bank robbers.

The Private Eyes is Hong Kong singer and the film's costar Samuel Hui's third Cantopop album.

The use of street Cantonese was justified as the film, which depicted the working class, struck a chord with Hong Kong people after its release.