The unknown female corpse on the autopsy table had a "Z" button between her fingernails.
When forensic doctor Su Yan pulled out half a silver cufflink from the corpse's fingers, she did not expect that this metal piece engraved with spiral patterns would pull out a chain of sin across the three countries - 97 "experimental products" were soaked in metal tanks on the Snake Bone Island in Southeast Asia; 33 human lives were connected to wires in an abandoned factory; even car accident corpses in the hospital morgue had crystallized transparent mucus hidden in their wrists.
"Ghost injection" turns refugees into test materials, and a retired police officer becomes an accomplice in order to save his son, using the detonator to exchange for the last part of the formula code. But when Su Yan found the engraved code on the fragment of her sister's skull, she discovered that the most terrifying thing was not the medicine, but the human heart.
There is no way to pursue the murderer from God's perspective. Su Yan's scalpel cuts through the rotting body, and also breaks through the disguised "accidents" - the silver buckle locks the truth, the cold corpse hides obsession, and what she is looking for is never the murderer, but the name behind each number that has not been swallowed up by the darkness.
