Yu Chau is a cop who has gone so deep undercover within the triad. He can no longer tell which side of the law he's on. When he accidentally kills one of his pals in an operation, he runs off into the boonies to lick his wounds. Upon his return, he teams up with fellow officers Jim and Jackie to catch a triad Boss, only to unveil collusion with government officials at the highest level. Yu Chau once again faces the dilemma of taking the law into his own hands...

The Trough

The chief security officer at a top-secret medical facility finds himself caught in an explosive battle when a young thief and his accomplices steal a groundbreaking curative medicine. After discovering the true origins of the medicine, the officer must decide who he can trust to protect the cure from falling into the wrong hands, and prevent an all-out war from bringing the city to its knees.