On June 18, 2018, there was heavy rain and lightning and thunder on the day of the Dragon Boat Festival.In the early morning of the next day, Zhang Qing was murdered at her home in a village in the city, and Li Fei was arrested as a suspect.In court, Li Fei only admitted robbery and rape, firmly denied murder, and asked the police to continue investigating.A year later, the case returned to police attention.The director decided to hand over the case to Jiang Guangming, the household registration policeman at the police station.At the same time, newcomer Shi Luo was discovered by the director while reading a novel in the office and was asked to write a review. His offer was also declined by the director.

On the other side, Gu Jiming's new book - Black Rain - was a huge success in the market, making him a well-known writer.At a sharing meeting, he revealed his girlfriend Su Zhenzhen, a disabled woman in a wheelchair.Su Zhenzhen has a strong desire to control Gu Jiming, but the two have a deep relationship.Gu Jiming had a drinking party with people from the publishing house in the evening. Although Su Zhenzhen did not go, she sent Xiao Wang to follow.When Gu Jiming left the hotel, Su Zhenzhen suddenly felt uneasy and asked Xiao Wang to go to the hotel to investigate immediately.

When Xiao Wang arrived at the hotel private room, he found that there was no one there. Su Zhenzhen was shocked.Then, Gu Jiming suddenly appeared next to her and explained that he had canceled the drinking party.In order to appease Su Zhenzhen, he proposed to her, and Su Zhenzhen readily agreed.Jiang Guangming shared the news with her husband that she had rejoined the criminal police team to investigate the case. Although her husband was somewhat dissatisfied with her decision, he ultimately expressed support and reminded her to pay attention to her safety.

When Shi Luo attended a reading sharing meeting, he discovered that the description in "Black Rain" was strikingly similar to the circumstances in which Zhang Qing was killed.He proposed this discovery to Jiang Guangming and other team members, and suspected that Gu Jiming might be related to the case.However, Jiang Guangming and others did not immediately adopt his guess, but decided to continue their in-depth investigation.