The next morning, the two of them go to investigate the disappearance of the notebook. They find out that the original model was a dell 14r, which is about the same price as the current one. They also learn that the helmet that Luu Ling took was made of two parts, one upper part and one lower part, and that the middle part was made up of three bone fragments. If she shoves a thick notebook into her bag, it will damage the helmet, and it is likely that she will not be able to open the zipper. They learn that Gao Ling and nian Xiaoping were both killed, at least six hours apart. The person who killed Gao ling was the "buyers" . The buyer who followed her to the cave and killed her was the one who killed baokang. The killer figured that the river water would be enough to flush her body into the river, because she found the buyer.