Follows an investigator as he prevents a terrorist attack during a symposium held by Hong Kong's Independent Commission Against Corruption. He later finds it has links to human trafficking in Thailand.

ICAC principal investigator William Luk takes his job seriously, and he needs every last scintilla of support from his team to take on the powerful and cunning Supt Wong, who is corrupt to the core. Wong is an enthusiastic tool of the monstrous Malcolm Wu, a cowboy big-time share trader who will stop at nothing to secure a large slice of the upcoming float of the HK government pension fund, worth billions.

Liu Yue Ping reports to the ICAC about a rich 2G Cao Yuen Yuen who bribed officers of the Hong Kong Correctional Services (HKCS) from inside the prison. William Luk decides to infiltrate the prison as an inmate to conduct his investigation, while his partner Ching Tak Ming and Chief Inspector Lau Po-keung back him up from the outside.