In the mid-to-late 1990s, Pinghai National cotton factory went bankrupt and liquidated, and the workers' resettlement fees were delayed. Rumors of corruption spread among the factory director Xiao Geng Shi. Worker Jiao Tong Sheng had been collecting evidence of Xiao Geng Shi's corruption, but drowned on a rainy night. Luo Shi Xiang, the police officer in charge of the case, quickly launched an investigation. After investigation, he found that Jiao Tong Sheng's death was related to his collection of evidence of corruption, and gradually locked in the suspect Xiao Geng Shi. At this time, Jiao Tong Sheng's daughter Lin Shuang Sheng began to silently check clues because she suspected her father's sudden drowning death, trying to provide effective evidence to the police.