The growth process and work experience of the protagonist Cao Zheng stories from the old Chinese a poor shepherd boy grow into a new China of forensic experts, showing the establishment public security criminal investigation team hard and communists seek truth from facts and overcome all the difficulties and hardships of the style of the great courage, spirit and style to the security men selfless. The new China was founded at the beginning, in the face of the complex social situation, Cao Zheng with the Communist Party the dauntless revolutionary spirit, seek truth from facts and the style of wisdom not to stick to one pattern, the start empty-handed way,, from a camera, a dog, a microscope to create the Communist party own criminal investigation team, and personally led the team, uniforms criminals with wisdom, with legal and rational conquer hearts, in order to maintain the leadership of the governing party, maintain social stability, to build a peaceful struggle with a time of national peace and order.