Nine years ago, a series of "Shadows of Death in the Mirror" secret room murders occurred in Lingchuan City that shocked the entire province. The murderer used mirrors as a ritual and took away the victims' eyes in a closed space. No fingerprints, footprints, or weapons were left at the scene. The seven victims died in strange ways. The leader of the task force, Shen Yanci, encountered an explosion while chasing the murderers. Their lives and deaths are unknown, and the case has become permanently unsolved. Nine years later, Shen Yanci returned to the Criminal Investigation Bureau as a "trace identification consultant who returned to the team with amnesia". He was accompanied by a taciturn young partner Lu Zhizhe who was proficient in criminal psychology and profiling. One person read traces and the other read people's hearts. Unraveling strange unit cases such as murders reproduced in mirrors, corpses sealed in old buildings, bone boxes at the bottom of rivers, and file erasures. Each case points to the remaining shadow of the case in the mirror nine years ago. The murderer never disappeared, but hid under the order and continued to harvest the so-called "guilty people" in the name of "liquidator." As clues are peeled back layer by layer, Shen Yanci's lost memories gradually come back, and the truth about the explosion, the identity of the undercover agent, the ghost in the police station, the old sins of the family, and the serial original sins spanning twenty years are revealed one by one. Behind the mirror are not evil ghosts, but avengers swallowed by the system and human nature, and he and Lu Zhizhe are the two most critical pieces on the murderer's chessboard. Using traces as blades and psychology as shield, they pursue the murderer in the fog of lies and search for the truth in the dangerous situation of life and death. Finally, they tear away all disguises and let the traces of dust that have been covered in dust for nine years illuminate all the hidden crimes and truth.
