Sun Honghui, a retired criminal investigation captain, found a body while hunting in the forest. Jun Guo, the new criminal investigation captain of Longshan County Public Security Bureau, and team member Xiao Wang rushed to the scene. The skull of the deceased was shattered by a blunt instrument, and there was a copper cigarette holder beside him, and there were two footprints, one light and one heavy. It is estimated that the criminal may be a cripple. During the measurement, a monkey appeared beside the body and made a piercing cry, but it refused to go away. Jun Guo brought the monkey back. Through various signs such as monkeys picking up coins and bowing, Jun Guo judged that the deceased might be a monkey juggler. Xiao Wang checked all the hotels, and only Wutongba Hotel received monkey-playing men. Ma Erchang, a hotel waiter, confirmed from the photos of the deceased that this is Lu Yunxiang, a monkey-playing man from Henan. Besides the monkey, he also brought a goat. The monkey found the goat in the mutton soup noodle restaurant opened by widow Zhang in Zhuziping market and bought it. That night, another cripple came to the shop. After close surveillance, it is clear that this shop is the stronghold of a smuggling ring. The lame man is Liu Xinggen from Highway 3 checkpoint, nicknamed Tie Guai Liu. Widow Zhang asked the driver Jin Yongchang to help smuggle fake gastrodia elata, but he didn't want to. Jin Yongchang took the widow Zhang to the public security bureau with bootleg goods. Just as the widow Zhang provided the news of Tie Guai Li, Tie Guai Li was found dead in the ruins. According to the widow Zhang, the goat was sold to her by Li. Li confessed that the goat was picked up by him and Ma Erchang on the road. After analysis, the possibility of Li committing a crime was ruled out. As soon as the monkey saw the paw prints on Ma Erchang's neck, he jumped up like crazy. Marchang fled into the valley. During the raid, Marchang was found dead under a cliff. After repeated research, the Public Security Bureau, from the depth of footprints, associated with the professional characteristics of the driver's right foot stepping on the accelerator for a long time, gradually narrowed the suspect to Jin Yongchang. The criminal investigation team decided to arrest Jin Yongchang. Kim escaped by car and fell off the cliff with his car, and was punished as he deserved.