The outline of the mysterious organization NAA gradually emerges. Luo Hanxia and Mowettin track down the truth of hallucinogens on the one hand, and challenge a series of impossible crime puzzles on the other Three coffins, aseptic chambers, high-altitude cells, underwater chambers, phantom snipers, and tunnels disappearing However, more complicated than the cases are the hearts and minds of the people, and a struggle between you and me quietly unfolds around them, and the relationship between them becomes more and more subtle. The prey has been exposed, willing to hunt with me?