Song Xingchen and I visited the assistants, and through face-to-face questioning, I ruled out each of them one by one. However, I was still hoping to check the surveillance videos in the ballistics center to determine if there were any chinks in the armor.

Their hands were tied regarding this matter so I could only look to Bingxin for help.

"Song Yang-gege, I’m in the university laboratory right now. The soil sample has been analyzed. I found coal and lime," reported Bingxin.

"Coal and lime?" I mused. This didn’t narrow the range at all. There were many heavy industrial factories around Nanjiang City.

It was getting late so Song Xingchen and I said goodbye to each other and agreed to meet early next morning.

The next day, I was awoken by a...