A murder case on a rainy night broke the peace of the city. Senior female detective Sha Tiantian was ordered to face the danger, wearing a cool windbreaker to break through the fog. The strange fingerprints at the crime scene and the dark red bloodstains in hidden corners were not only key clues pointing to the real murderer, but also unexpectedly touched her traumatic memories that had been buried for many years - the unsolved case that led to the murder of her best friend was surprisingly related to the series of cases in front of her.
With her high heels on the road to pursue the murderer, Sha Tiantian uses "traces" as a blade to unravel the mystery of human nature through clues: seemingly unrelated victims, deliberately erased traces, and mysterious black shadows that flicker and disappear, behind which lies a chain of sin that spans a long time. The trust and support of her partner Jiang Yi allowed her to break through the haze of the past while strengthening her determination to pursue justice.
When bloodstains and scars overlap, and clues and memories intertwine, Sha Tiantian must not only locate the real murderer in the fog, but also face the "sharp blade" in her heart. Every trace is a silent testimony, every reasoning is closer to the truth, and she will eventually cut through the darkness with the edge of criminal investigation, making the hidden evils invisible, and complete self-salvation on the road to arresting the murderer.
