On a rainy night in Ningchuan, an old case reappeared.
Criminal profiling consultant Jiang Du can always hear the heartbeat of someone who has been missing for three years.
The voice of former detective Lu Zhi.
He could see the past in the "echo", but he couldn't catch the person hiding in the shadows.
The informant was killed, the shoe prints were copied, and there was a breath on the other end of the phone...
When everyone thought Lu Zhi had died in the line of duty, Jiang Du clutched the old photos and said word by word:
"I'm not looking for it anymore? Impossible."
Purpose: Criminal investigation to solve the problem and explore the truth and human nature