In the late autumn of 2023, while debugging the newly developed "City Memory" cloud system, smart home engineer Lin Xu accidentally discovered a set of strange data: at 23:17 for three consecutive nights, the voiceprint of a baby crying would always fluctuate from Room 1704, which had been vacant for three years next door. What's even more bizarre is that the corridor surveillance she secretly retrieved showed that the exact same gardenia fragrance as the scene of the murder five years ago was oozing out from the cracks in the door of this haunted house labeled by the police as the "Red Shoes Cold Case."
When Lin Xu ventured into the dusty room, the smart thermostatic system suddenly started, and the holographic projection on the wall reproduced the afterimage of the dancer in red who fell from the building. The chip in the ballet shoes she picked up actually recorded the biological information of the old neighbor lady who died last week. Criminal investigation captain Lu Chen brings even more shocking news: the cell phone of the apartment security guard who drowned three days ago contains 4K images of Lin Xu's activities in the murderous house last night - and the timestamp shows that it was taken before she was born.
As more dead people appeared in the real-time monitoring screen of the cloud system, Lin Xu discovered that the AI algorithm he had written was automatically generating new death notices. When the iris data of the twin sisters who were killed in a childhood car accident suddenly appeared at the murder scene, the past buried by the data began to tear apart the city's shiny technological surface.
In this race with ghost data, every pixel may be a fatal trap, and every piece of code hides a bloody will. When Lin Xu finally deciphered the last AI will woven in Morse code, what awaited her was the scarlet alarm that suddenly lit up in the entire city's security system...
