Big Mad robbed a huge amount of diamond, and ask Lee Wan Fay who was a stolen good dealer to sell the goods, Big Mad want to kill Fay and get all the goods. Fay escaped and stole the diamonds. Inspector C. K. Lee assigned undercover cop Lond to take up the identity to get acquainted to Fay. Although Long and Fay knew they shared a different path in life, the time they had only one goal but to get Big Mad and his gangsters.
