Xia Dan from the provincial public security department investigated the case of her cousin’s death from drug abuse and found that it was related to a cross-border drug-trafficking group. She cooperated with Hong Kong police officer Kalong to go undercover and got in touch with the group leader, Leng Yue, and her superior, Li Shaoyuan. The police used technical means to locate the international drug dealer Tony. To gain the trust of the drug dealers, Xia Dan had to shoot Kalong dead in front of them…
