There had been significant progress in the investigation of the case.
On the one hand, Chen Yan's reasoning about the case had at least taken shape.
This was very important.
Only when the reasoning of the case was successful would it be possible to follow the clues, analyze the clues, and construct the entire criminal process.
After all, before Professor Sun Muzhi came, Chen Yan couldn't even figure out how the murderer killed.
And now, the other party's motive had been found.
With a motive, they could narrow down the scope of the investigation.
The most important thing now was to find out who or where Wang Hu, Yin Chengwen, Gao Tiancheng, and Xu Dongtian had undergone hypnosis training.
Moreover, he had to be fast.
According to the time sequence of the four people's suicide, it was basically one per week.
Originally, Chen Yan thought that the murderer did it on purpose.
