The Detective is a crime thriller film that follows a detective as he investigates a series of crimes involving a young boy and a mysterious watch. The detective must unravel the secrets of the watch and solve the case before more lives are lost. With twists and turns at every corner, the detective's journey becomes increasingly dangerous and intriguing.

A detective is assigned to a series of high-profile cases. As he delves deeper into the investigations, he discovers a complex web of corruption and deceit. With his skills of deduction and intuition, he must navigate through the twists and turns to bring the culprits to justice.

Chen Tan, a private detective in Thailand, travels to Malaysia following a series of clues found in a photo. There he searches for a man called Chai, who might help reveal the truths behind the murder of his parents 30 years ago. Chen finds Zheng, a Malaysian detective born in China. Together they meet Chai's daughter, Zi-Wei who could hold the key to cracking the case.