On a rainy night five years ago, a young woman vanished under mysterious circumstances. The official ruling was suicide. Five years later, former archivist Shen Zhao uncovers traces of the real culprit, buried in a fleck of fluorescent paint stuck to an old umbrella rib. Forensic pathologist Cheng Yan secretly reopens the autopsy for her, the graffiti of itinerant artist Lin Zhiyao pieces together the murder's trail, and the silence of old-bookshop owner Zhou Yun conceals a secret heavier than the murder weapon. When fingerprints from her sister Su He's patient match the evidence, the fissure in the truth begins to tear through everyone's limits.
