Wen Jing, 27 years old, is a top forensic evidence analyst, known for her absolute rationality and zero emotional output. The accident in which my mother drowned in the bathroom when I was nine years old left an irreparable memory gap - I only remember a floating hem of indigo cotton and linen clothes, and the feeling of suffocation from being pinched in the last breath before sinking into the water. Twenty years later, three highly simulated "bathroom drowning cases" occurred in the city: the constant temperature was 28.3°C, the same cedar and amber aromatherapy, the deceased was lying on his back with his knees bent, and even the evaporation rate of the water stains was accurately replicated at the scene. When the words "She was not dead when you pushed the door open" written with fingernails appeared next to the fourth corpse, Wen Jing was forcibly transferred to the task force and partnered with Chen Yanshan, an old detective who did not believe in metaphysics and only believed in ballistic trajectories. As the evidence chain collapsed layer by layer, she discovered that her mother's death involved a "right to breathe contract" spanning three generations - the family sacrificed the memories of female members in exchange for recessive hereditary neuromodulation abilities; now, the murderer is using the murder to reenact the ritual to force her to awaken the sealed memory of the ninth year. This is not only a hunt for a murderer, but also a self-detection that opens the skull inwards: every DNA report is a testimony, every frame of surveillance afterimage is a confession, and the real crime scene is always deep in her own hippocampus.