Mitsuhiko, Genta, and Ayumi arrive at the Beika City farmer's market. Conan was unable to come due to something that suddenly came up. The Detective Boys happen to overhear a conversation between Kadokura, Yamawaki, and Kaori. The group is discussing... (more) the "explosive" time they're going to have, leading the kids to reason that they're plotting to bomb Inspector Megure, who is scheduled to deliver a speech at the event. The group of adults splits up and begins taking action. Genta follows Yamawaki, Mitsuhiko follows Kadokura, and Ayumi follows Kaori as they attempt to find evidence of their criminal activity, but...