Tang Yuan, an ordinary migrant worker, unexpectedly has the special ability to communicate with rats, flies, cockroaches, and mosquitoes, and becomes a special civilian consultant to the police. She relied on this group of "four evil informants" to collect secret clues that ordinary people could not obtain, and successively solved the murder cases of women living alone and the poisoning and murder cases of workplace bosses. Later, he was involved in the unsolved case of serial dismemberment on rainy nights that lasted for seven years, and finally the serial murder case was completely solved.
