Ran wakes up in a hut in the woods and discovers someone has treated the wounds from when she fell. Eventually, Kazuha finds Ran and calls Kogoro in. Heiji radios them from the next room. They all go over and find that the room is filled with pictures of Shin'ichi with knife marks in them. Heiji figures out the case, and they head back to Hinohara's house. There, Heiji reveals that Shin'ichi is actually Makoto, who used plastic surgery to look like Kudou Shin'ichi. Shirigami-sama steps into the room and is revealed to be Shin'ichi. After Makoto is arrested, Ran, Heiji, Shin'ichi, Kazuha, and Kogoro walk back toward the hotel. Before they can reach it, APTX 4869 starts to wear off, and Heiji helps Shin'ichi escape to the bathroom to change back. Haibara had been hiding there, and she gave Shin'ichi another antidote. Then, she says to return to Tokyo before he changes back if he wishes to keep his identity a secret. The group are all heading home in Kogoro's rental car, when they discover a man who was strangled within his car on the highway. They stop to investigate.

The antidote to the APTX 4869 begins to wear off and Shinichi is about to change back to Conan. Ran holds onto him and refuses to let him go. As Shinichi attempts to find a way to hide and change back to Conan, Ran is tranquilized by Haibara and Shinichi is able to become Conan again without anyone noticing. The Detective Boys are on a camping trip when Professor Agasa's car runs out of gas, stranding them in the middle of the mountain. A man named Gouki Sudou drives by and refuses to help their situation. Soon after, the Sodou drives to his home atop the mountain and an explosion occurs. The Detective Boys arrive to find Sudou dead. The police investigate and declare the death as an accident caused by a lit cigarette and spilled gas which vaporized in the garage. As the police interrogates Sodou's wife, Ena Ginbayashi, Conan reveals Sudou was not smoking a cigarette and that something else caused the explosion. Due to Ena's consistency with her story, Conan deduces the explosion was a planned murder by Ena.