A man living alone died suddenly and mysteriously. There was no flaw at the scene and everyone believed it was an accident.
Trace consultant Lin Yan saw through the carefully disguised murder with only three subtle traces.
There is an assembly line murder organization behind the scenes, which specializes in targeting lonely people, and every murder can be perfectly acquitted.
Lin Yan followed the clues left by the murderer in the blind spots and led a team to chase the murderer across the city, tearing apart a series of murders that spanned several years and uprooting the entire criminal chain.
