In a crowded and noisy subway station, a ragged man and his heavy suitcase aroused the vigilance of security personnel.After a chase, the man claimed that there was a bomb in the suitcase, which immediately caused a huge commotion.When the riot police arrived and subdued him, they found a body curled up in the box.The arrested man’s name is Zhang Chao, a well-known lawyer in Jiangtan City.He initially confessed to the crime, but later produced an alibi and recanted his confession in court.

For this reason, experienced criminal policeman Yan Liang quickly joined the task force.Not long after, - Jiangtan Evening News - female reporter Zhang Xiaoqian received an anonymous letter. The sender claimed that she wanted to play a nine-square grid game related to the case.For a time, the case became confusing, and as the investigation deepened, Yan Liang also discovered that the case was actually closely related to a case many years ago...

This film is adapted from Zijin Chen's novel "The Long Night Is Hard to See".