Drug enforcement detachment A group leader Qi Yannan in a latent against drug trafficking gangs when sudden changes. The investigation of criminal suspects "black three mm" also attracted the prosecutor Lin Bing just and stern. At the same time, in order to get a priceless ancient Chinese medicine secret recipe "mystery and kill", all forces stretches out the black hand, Jin Rong Su, President of a large financial securities company is one of them. Su Jintang is selling financing channels of drug gangs mastermind Ke Shilan, and interest is one of the partners, and even some shot, secretly use secret help Ke Shilan escape. On the occasion of the vicissitudes in the international arena, director Ma told Qi Yannan and a belief in public security police, at the same time to have the toughness, resistance and tolerance. Qi Nan Yan and Linbing under the encouragement and support of the people, to take the bull by the horns, not afraid of sacrifice resisted all pressures, the chase for criminals. Eventually, under director Ma lead and a group of colleagues to work together, Qi Yannan innocence scrubbing and ice Lin let bygones be bygones, the two sides work together to mutual aid, the hidden, the fugitive criminals one arrest.