A major stock exchange in the world, Hong Kong attracts not only money but also many who try to manipulate the market. At the Hong Kong Police Force Commercial Crime Bureau, an operation is under way against insider trading involving Feng Hua International, a listed company. The interception team at the Criminal Intelligence Bureau is sent in. Led by Inspector Leung Chun-Yi (Lau Ching-wan), the team of veteran cop Yeung Jen (Louis Koo) and the young rookie Lam Yat-Cheung (Daniel Wu) infiltrate Feng Hua International to install interception devices and start to monitor the companys phone traffic. Over time, the three cops become increasingly thrilled by the secrets they heard while conducting surveillance on the listed company, without knowing the blood and danger awaiting them.