After returning to the crime scene, his subordinates handed an envelope to Chen Shi, and he asked in surprise, "What is this?"

"Captain, it was found in the car of the deceased."

The envelope had no seal and no postmark. When he opened it, there was a printed piece of paper with "Life Function" written on it. Below were a lot of inexplicable formulas and symbols. The only ones Chen Shi could make out were a few Chinese characters. "M = murder; P = crime of passion; A = accidental murder."

"What kind of stuff is this?" Chen Shi was confused.

"Death signature?" Lin Dongxue leaned over, "But who can understand this kind of signature?"

"Um... Old Peng was a science major. I wonder if he can understand it. Let’s all head back!"

Back at the bureau, Peng Sijue was not in the...