Shen Zhao, the most feared 'broom star' in the police department, asked serial killers to surrender en masse at the first word. No one understood why he could hear the echo of sin, not even he believed it. Until Han Lin discovered that all those who surrendered had seen the same vague graffiti - and that pattern was drawn by his daughter when she was five years old. Forensic doctor Su Yan hides the secret of bloodline, Luo Xiao is forming a killer alliance in prison, and technician Chen Sui uses children's cries to guide prophecies. When Shen Zhao's silence was pushed into the news headlines, the real prey began to bite back.
