Through a reliable source from journalist Yip Ting, Yau Ching probes into a secret organization, during which he nearly gets himself killed and cannot resume duty immediately. After seeking aid from his girlfriend Chung Yat Ka, who accesses the database in secret by leveraging her duty as the intelligence analyst, he uncovers that there is a mole in the intelligence agency. His younger brother Yau Kit not only suspects him of being a traitor but also takes advantage of his absence to court Yat Ka.