When blue becomes a signal of death, and salvation degenerates into an excuse for murder, a deadly feast designed for women is quietly unfolding in the shadows of the city.
Four bizarre murders have occurred in succession in Nan'an City. All the victims are elite women aged 25 to 35. Each died of an overdose of high-purity heroin, and mysterious blue crystals known as "Blue Blood" were found in their bodies. There were no signs of forced entry, and the victims wore peaceful expressions. The only clue left behind was a black card bearing a riddle: "For the most beautiful you."
Lin Yan, captain of the criminal investigation division and a police detective known for her cool-headed sharpness, discovers a hidden connection among the seemingly unrelated victims: they were all members of "Secret Garden," a private online community for women. This invite-only, highly encrypted platform is quietly cultivating a twisted philosophy of "salvation."
When psychiatrist Qin Yuwei becomes the fifth target to receive a "blue gift," Lin Yan's investigation strikes a nerve with the killer. The criminal profile points to Li Jingshu, a former biochemistry professor disgraced by an academic scandal, a woman who lost everything in the real world but built a twisted kingdom in the virtual one. Under the name "Blue Moon," she weaves a deadly narrative of "liberation" and "purification" in Secret Garden.
But as the investigation deepens, Lin Yan discovers that she, too, appears in the killer's photo album, labeled "the blue one most worth choosing."
Time is running out. On the night of the full moon, nine days from now, who will be next on the death list?
This is a war among women without gunfire, an extreme rebellion against society's expectations of the "perfect woman."
