Cocoon

On the eve of the Beijing Olympics, the body of a woman who had been dead for many years was discovered in a valley in Mentougou. Forensics determined that she had been murdered. Was she a celebrated dancer, or a woman of the night whose name no one knew? It was all a mystery. But while investigators searched for the woman's identity, they found a diary among her belongings, filled with remorseful confessions: "I have killed many people..."

Zheng Lin, a female forensic pathologist eager to work on the front lines; Lin Youcheng, a police auxiliary officer dreaming of becoming a full-fledged officer; and Zhan Lei, a down-and-out entomologist, each set out to find the truth for their own reasons. One long-buried case after another would once again be exposed to the light of day...