Detective Conan and Kaneda Junior's Case Book were both classic Japanese mystery novels, which contained many interesting plots and suspense events. In these two novels, the two famous detectives 'golden finger is a special ability that can help detectives solve cases, but they also need to use their own wisdom and reasoning ability to find the truth. In Detective Conan, the golden finger usually referred to Conan and his elementary school assistant, Haihara. Conan could read other people's memories and thoughts to obtain key information, and the cheat could also help him predict future developments and changes in events. When solving cases, Conan and Haihara needed to use their intelligence and reasoning ability to find evidence and clues. At the same time, they also needed to rely on the clues and evidence of other detectives to gradually narrow down the scope and finally find the real criminal. In " Jin Tianyi's Youth Incident Book ", the golden finger usually referred to Jin Tianyi and his assistant, Fuji Shusuke. Jin Tianyi could read other people's memories and thoughts through the golden finger, and he could also use the golden finger to perform superpowers such as teleportation and instant disappearance. When solving the case, Kaneda Izumi and Fuji Shusuke needed to use their wisdom and reasoning ability to find evidence and clues. At the same time, they also needed to rely on the clues and evidence of other detectives to gradually narrow down the scope and finally find the real criminal. Detective Conan and Kaneda Ichisho, the two intertwining famous detectives in the case book. The golden finger is a special ability that can help detectives solve cases, but they also need to use their intelligence and reasoning ability to find the truth.