Description: The exhibits of an environmental protection craft competition held during the summer vacation are destroyed one after another, but the students all have proof of their absence, how did the suspect "hide"? The valuable out-of-print stamps are stolen the moment the train enters the tunnel. In order to solve the case, we have to find out the key "black hand"... Inside the uninhabited villa, there is actually a secret room in the mirror, and Ai Xiaopo accidentally breaks into it and discovers traces of the black raincoat thief's past. What is the secret hidden in this strange house?
