I carefully studied the palm print, noting that the fingerprints were blurred. There were two possibilities–the first was to cover the fingerprint with 502 glue and the other was to corrode it with chemical agents. I required a sebum test to determine which it was.

The rest were handed over to the technical team. Xiaotao passed me a tablet with photos of several sets of footprints the officers had just snapped. "The shoe size and print match those left by the four young masters."

"Yes, it’s almost impossible to tell their height and weight…” I said, “But there are still some differences. After all, someone else’s shoes don’t fit as well.”

I pointed to a set of footprints, "Look at this. The person wearing the shoes obviously has bigger feet, flattening the edges of the shoes... And...