The two of them arrived at the construction site. At this time, the construction workers had already finished work and set up a wooden board to eat on. When they saw two strangers coming in while they were eating dinner together, they looked at the two curiously.

A foreman came over and asked, "Who are you looking for?"

Lin Dongxue showed them her badge. "We are investigating a case and want to look around."

Then, they turned around and started looking for clues. Chen Shi occasionally picked up a little soil as samples. Lin Dongxue suddenly called out, "Old Chen, look at this."

She pulled out a shovel from a pile of sand. Because it had been used for a long time, the surface of the shovel was very smooth and the edges were sharp. Lin Dongxue inserted it into the ground and said, "This thing is sharper than I thought. You can probably...