A shocking shooting at a wedding banquet unravels the threads of two mysterious cases, drawing elite members of Hong Kong’s forensic and police departments back into action. As they join forces to uncover the truth, they reaffirm their commitment to justice and the rule of law.

Senior Chemist Jack “Pro Sir” Po, known as a walking encyclopedia for his vast knowledge, teams up with Chung Hok Sum, a passionate and highly skilled forensic pathologist whose unconventional methods often yield surprising breakthroughs. Their shared dedication to forensic science sparks a strong professional bond as they work side by side to crack the case.

Meanwhile, Senior Inspector Ada Ling of the West Kowloon Major Crimes Division brings sharp strategy and leadership to the investigation. Supporting her is Sergeant Lee Chin Fung, a former Flying Tigers officer from a privileged background who chose a path of justice over comfort, driven by his ideals.

Together, this formidable team tackles the city’s most challenging crimes, proving once again that truth and justice always prevail.