Zhu Yueling is a female criminal investigator in a major crimes unit in the twenty-first century. After an accident, she opens her eyes to find herself an orphan on the outskirts of a city in the 1980s.
The original owner of the body fell into a human trafficker's trap and was locked in a cold, dark cellar. She died of fright, making way for Zhu Yueling's soul.
Trapped in the cellar with no way out, she subdues a trafficker with her bare hands, calmly prepares a defense, and waits for the municipal criminal investigation team to arrive.
Everyone thinks she's just a terrified, helpless young woman. No one expects this girl, fresh from escaping a den of horrors, to be an expert in trace evidence, crime scene reconstruction, and criminal profiling.
A single footprint, a spot of blood, or the faintest trace can become conclusive evidence identifying a criminal.
She spots the flaw at a glance in cold cases that leave veteran investigators scratching their heads. She untangles the threads of gang cases that have resisted every attempt to crack them, then rounds up the whole gang.
She goes from being a young victim rescued by chance to a special investigator in the municipal criminal investigation unit.
Criminal investigation methods are primitive in this bygone era, and clues are scarce. But armed with a modern approach to criminal investigation, she parts layer upon layer of fog and hunts down the evildoers hiding in the streets and alleys.
Ji Lin was a deputy section chief in criminal investigations who led teams on cases. At first, he saw her only as a victim. After working alongside her on case after case, he finally sees the sharp, dazzling brilliance hidden beneath her quiet exterior.
As she investigates one bloody case after another and pursues one killer after another, she rises to legendary status in the criminal investigation unit through her own efforts, in the 1980s, an era without DNA testing and with rudimentary equipment.