Conan reveals to the suspicious woman that he knows her identity - it is Kudo Yukiko, his mother, in disguise. As they discuss the case, Kogoro calls all the passengers to witness his inaccurate deduction, enabling Conan to figure out the trick. However, a worried Conan recalls that in the novel, the detective boy who solved the case was murdered by the trap he set for the criminal. Yukiko volunteers to act as a decoy to help him find the proof. When the train lands at Sapporo Station, however, Conan and Yukiko are separated and the criminal moves, intending to push her onto the tracks. Yuusaku appears just in time and reveals the trick and his own identity to the criminal, who had idolized his work.