Seven years ago, a tragic case of extermination of a family occurred in Xilong, Fujian. A family of five died tragically on the same day in a villa, which caused a great shock in the society. However, after many years, the suspects Yang Zidao (played by Guo Tao), Xin Xiaofeng (played by Deng Chao), and Chen Bijue (played by Gao Hu) are still at large. Nowadays, the three of them live in Xiamen. Yang became a taxi driver, Xiaofeng joined the auxiliary police team, and Chen, who became a fool due to an accident, took the tail of the girl picked up by the three people and lived in the fishing farm of his relatives. On this day, Yi Guchun (played by Duan Yihong), who has rich experience in handling cases, was transferred to Xiaofeng's team as the chief of police. Yi valued Xiaofeng, who had excellent ability, but he also had a keen sense of smell and vaguely felt that this man was related to the extermination of the family that year. During this period, Dao Ge met Yi's sister Xiaoxia (played by Wang Luodan) by accident. It seems as if there is an invisible hand in the dark, pushing these three men who are determined to start a new life to an irreversible ending... This film is adapted from Xu Yigua's novel "Sunspots".