A bloody body falls seven stories onto a residential courtyard in the Eastern District of Hong Kong. The fallen body is police officer Tai, who was in the building with Chief Inspector Ling (Aaron Kwok) as they sought a serial killer whose known M.O. is an electric drill.
Both officers are rushed to the hospital. Officer Tai barely survives, with body wounds matching the M.O. of the serial killer. Chief Inspector Ling wakes up at the hospital unable to remember anything leading up to the attack. Suspicion then arises that Chief Inspector Ling may be the murderer ... Add Synopsis In Portuguese