Female forensic doctor Lin Zhixia found a regular scratch on her neighbor's door lock that shouldn't exist. A bottle of unfamiliar perfume stood quietly in front of the door, but inside the door, there was an absolute silence that completely violated the owner's decades of inactivity.
The forensic instinct suddenly awakened. She did not alarm anyone, but analyzed the mystery that was so close at hand as if examining physical evidence: the missing surveillance footage, the blurry gray shadow of the property manager holding a toolbox in his mouth, and the strange trembling of light and shadow under the crack of the door. All the isolated anomalies are connected in an ominous trajectory - the disappearance of the neighbors is not accidental.
Danger no longer exists only in the cold light of the dissecting room. It has been dormant across the wall, penetrating into the subtle scratches of the door lock.
When the door of 1701 made a long "squeaking" sound as someone pushed it open from inside late at night, Lin Zhixia knew that her battlefield had moved to her door. What she has to face this time is the living malice that is still staring in the dark and pressing closer.
The truth behind the door has an unpredictable price.
