At 3:47 in the morning, the Criminal Investigation Detachment of Jiangcheng City Bureau received an alarm. The reporter, Ye Wan, is 28 years old. He is a former top student in physics who now makes a living by telling fortunes and lives alone on the top floor of an old residential building. She claims to have witnessed a murder occurring across the building from her window using binoculars.
When criminal police captain Song Ci led his team to the scene, Chen Shusheng, the head of the west door on the sixth floor of Building 3, was already a corpse with a knife in his chest and a pool of blood solidifying underneath him. The doors and windows were locked, and the room was in a secret state, so the murderer had no way to escape.
This is not the first time Ye Wan has become a witness to a murder. Seven years ago, her university tutor and optical professor Shen Weijun was killed at home, using the same method as this case. That case has not been solved yet, and Ye Wan was the last person to see Shen Weijun.
Two sightings, two cold cases, and a murderer who never disappears.
There is a notebook called "Perfect Diary" hidden in Ye Wan's residence. For three years, what she recorded was not her own life, but a set of precise optical observation data - the angle of the curtains, the color temperature of the light, and the reflectivity changes on the glass surface. These data point to Shen Weijun's last unfinished research before his death, and also point to a truth that has been ignored for seven years.
As Song Ci gradually approached the truth, he discovered that Ye Wan had never "happened" to witness the murder. Every choice she makes, every silence she makes, even her choice to live in front of that window, is part of a sophisticated plot. This planning started from the night seven years ago when she left and never got out again.
"The perfect thing is not the diary, but the light. The light never deceives people - the one who deceives people is always the person who sees the light."
Sounds good to pass the time