Legendary detective Tang Ren's apprentice Lin Mo travels to Bangkok to investigate a mysterious suicide, as rumours spread that the deceased was killed by the Four Faced Buddha.

With public pressure mounting, the police decide to perform religious rites, though Lin Mo's keen sense of smell reveals a clue that convinces him the events were man-made, not supernatural.

Lin Mo has a new lead suspect and tails them to try and catch them in the act, but things become more complicated when another death occurs.

With new evidence provided by Pei Shan, Lin Mo returns to the beginning of the strange events and investigates once again with his new perspective.

A young Lin Mo and his master, Lao Yu, work cleaning crime scenes for a criminal named Smiley. Lin Mo's indecisiveness while dealing with a murder case leads to tragedy.

Lin Mo follows the fragrance he smelled on Quinta, finding himself at a flower shop owned by Quina's wife Ivy, a women he soon finds has been involved in many fraud cases.