Sato reminisces about the bomber case three years ago. Three years ago, a bomber sent a fax to the Tokyo Metropolitan Police containing the location of a bomb in the form of a riddle. Matsuda discovers the bombs location and realizes that the bomb contains a clue an even larger bomb and that the clue is only revealed during the last three seconds before detonation; Matsuda sacrifices his life and allowed the police to locate the second bomb. In the present time, the bomber returns and sends a fax to the Police station. The Detective Boys along with Takagi and Sato attempt to decrypt the riddle and locate the bomb. An explosion occurs at Tokyo Tower and a girl becomes stranded in an elevator. Takagi and Conan free her but become trapped in the elevator themselves due to a second explosion. Conan finds a bomb in the elevator and begins to disarm it until a message appears revealing that a clue to a second bomb will appear in the last three seconds before detonation. Conan deduces the code and disarms the bomb with one second remaining and reveals the code is refers to the English word "Detective" and when flipped around in its kanji form, says Teitan, the name of the school. The bomb at Teitan High is disarmed and the bomber is captured.