With them being secure from the police, the culprits decide to find the remaining children and silence them once and for all to ensure the smoothness of their plan: to have the daughter of their original victim bring the ransom, lock her into the building, and eliminating all witnesses by setting it on fire. While one scours the empty building, the other remains behind in one of the rooms on the fourth floor, with Conan and Ai kept tied up and gagged in the open and their other victim sealed away in a locker. But what the two don't know is that Ayumi, Mitsuhiko and Genta have actually managed to slip into the very same room and hidden themselves in one of the lockers, now able to overhear the two culprits safely but unable to reveal themselves in order to rescue their friends! However, Conan has managed to grab hold of his Detective Boys Badge and, taking a leaf from the kidnap victim, he begins to tap messages based on the Tokyo Fire Department emergency codes to his hidden friends.