1992, Kowloon, Hong Kong. Strange things happened one after another in the Jinhui Pavilion commercial and residential building. A woman's face appeared in the golden glass curtain wall of the exterior wall, a white figure appeared in the patio, and the elevator stopped at the long-vacant ninth floor for no reason.
He Wenqian, the clerk in the bookstore on the second floor, is a fan of mystery novels. He sensed something unusual from the neighbors' comments and took the initiative to approach Detective Ma Guodong of the Yau Tsim Police District CID. The two entered the ninth floor to investigate and found traces of a secret residence, a pool of human blood on the bed, and a fake mirror with words engraved on the back. "What you see may not be true."
The clue points to Wang Yulan, a female clerk who disappeared three months ago. No one reported the crime, and no one took it seriously. But as the investigation deepened, He Wenqian discovered that the reflection angle of the golden glass and the echo structure of the patio were being carefully used. Those "hauntings" are not supernatural phenomena, but a distress signal sent by a trapped person with all his strength.
When Ma Guodong found the dying Wang Yulan in the mezzanine of the building, she told the truth: someone had locked her inside for three months, and the only thing she could do was to turn herself into a ghost in a building.
