In a deep compound, murders occur frequently. The deceased are often scared when they die. What is even stranger is that there is a fan next to every dead person!
Secret room! Is the secret room murder case man-made? Or is it the work of ghosts?
This case attracted great attention from the mysterious organization, and the three important figures of the M. R. Organization were all dispatched together. Detective, intelligence agent, spy! The police force in City S has been mobilized. Will this case give the protagonist Detective Hu a headache?