Conan deduces that the "locked" door was a trick involving a cassette tape and a heavy dictionary.
In the English dub of Detective Conan (Case Closed), is titled "The Girl from Black Organization and the University Professor Murder Case" . This pivotal episode marks the first appearance of Ai Haibara , a character who fundamentally changes the trajectory of the series . The Mysterious New Student Detective Conan (Dub) Episode 129
He identifies one of the professor's students, Akira Shirakura , as the killer. Shirakura had murdered the professor to prevent the release of incriminating photos and tried to stage the scene as an accident. The Bitter Aftermath Conan deduces that the "locked" door was a
Upon arriving, they find Professor Hirota dead inside a locked room, surrounded by fallen books. The local police initially suspect a tragic accident or a robbery gone wrong. However, Conan’s keen observation skills reveal a much more calculated crime: The Mysterious New Student He identifies one of
The episode concludes with a haunting moment: Haibara breaks down in tears, confronting Conan about why he couldn't save her sister, Akemi, despite his great detective skills. This emotional climax cements Haibara as a permanent, tragic ally in Conan's fight against the Black Organization.