馬來西亞某藥廠利用新型變種傳染病發災難財，一個自稱「洩密者」嘅神祕組織揭發黑幕。藥廠東主個仔同當地記者離奇自殺後，馬來西亞警長李永勤同香港督察王大偉合作追查真相。其後「洩密者」同香港日報記者阮嘉嵐聯絡並會面，兩位警探亦追蹤佢哋動向，三人同「洩密者」交手。
A pharmaceutical company in Malaysia uses a new variant of infectious diseases to make a fortune, and a mysterious organization calling itself a "leaker" exposes the shady scene. After the mysterious suicide of the son of the proprietor of the pharmaceutical factory and a local journalist, Malaysia Police Chief Lee Wing Kan and Hong Kong Inspector Wong Da Wei work together to find out the truth. Subsequently, the "leaker" contacted and met with the Hong Kong Daily reporter Yuen Ka-lan, and the two detectives also followed their movements, and the three of them fought with the "leaker".