Perfect Accident: Timers Are Water in the Air

The most difficult case I have ever solved. The murder weapon was water vapor, the fuse was fishing line, and the evidence destroyed itself after the explosion. The murderer was like a ghost, hiding within the laws of physics for six months. Everyone said it was an accident, but I was the only one who found the molten copper bead as big as a grain of rice. Others rely on surveillance and fingerprints to solve crimes, but I rely on mass spectrometers and aerodynamics to solve crimes. I am Lao Zhou, an old detective abandoned by the times. In this world filled with surveillance, I specialize in solving cases of "not human beings".