Shen Xinghe, a rookie detective who can see ghosts, encounters the ghost of a wagging tail dog on the first case he takes on - this golden retriever spirit named "Coal Ball" was a police dog in life, but retained the habit of holding slippers in his mouth after death. He always brought the evidence from the murder scene to Shen Xinghe's feet with his mouth. When they were tracking down a series of thefts, Coal Ball suddenly burst into the suspect's house and barked at the safe. As a result, three hamster spirits wearing thief masks jumped out of the opened cabinet door. What's even more outrageous is that the "woof" sound of the coal ball is equivalent to "amplification magic" in the ghost world. It howls at the murderer, and all the stolen goods hidden in the wall are shaken into the shape of glowing bones. This suspenseful investigation with the fragrance of dogtail grass is unfolding as the coal ball presses the ghost witness to the ground and licks his face to collect evidence, and unfolds a furry reasoning adventure in the detective agency smelling of dog food...
