The virus has swept the world for half a year, and the old world order has completely collapsed. Amidst the ruins, violence and crime have become the norm. The abandoned city "District 7" has become a place of lawlessness, but recently there have been a series of bizarre murders - the deceased died in strange ways, the chest was accurately dissected, the heart was missing, and each corpse had the same thorn mark carved between the eyebrows. Su Yan, the former chief forensic doctor of the Municipal Public Security Bureau, traveled alone through the crisis-ridden no man's land and sneaked into the Seventh District in order to find his junior sister Lin Wei who disappeared when the apocalypse broke out. She originally wanted to keep a low profile and look for people, but she accidentally bumped into a murder scene and relied on her professionalism to leave key clues, and was involved in the vortex of serial murders. The clues vaguely point to the "Ark Laboratory" that was mysteriously closed before the end of the world, and the doomsday oligarch "Black Crow" who controls the resources of the seventh area and has ruthless methods. Su Yan must not only evade the pursuit of the Black Crow forces, but also use forensic knowledge to analyze the secrets behind the murder. He must also be wary of the hidden malice of those around him - seemingly friendly scavengers, unidentified mercenaries, and groups of survivors who have their own agendas. Every investigation is accompanied by a test of life and death, and every victim is inextricably linked to the forbidden research in the laboratory, and the disappearance of the junior sister does not seem to be accidental. As the pieces of the truth gradually come together, Su Yan discovers that the end of the world is not only the coming of disaster, but also the purgatory of human nature. Behind the serial murders, there is also a shocking conspiracy that can completely wipe out the remaining human beings. She must walk step by step in the darkness, struggle on the edge of crime and punishment, use the truth to break through the haze of the apocalypse, and find a glimmer of hope for herself.
