The victim's fiancé busts in and tells the police he was ringing the door bell the day before because the victim missed an appointment. Conan knocks out Kogoro, and tells his deduction to everyone that Masayo is the murderer and the sealed room wasn't really sealed at all. To prove it, Conan directs the police to the bloodstain on the door and explains Masayo got blood on her headband and looked through the spy hole when the fiancé was ringing the doorbell.
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