A woman asks Kogoro to find her missing cellphone. She suspects that someone in her household is using it to find information about her affair. Although she manages to find the cellphone, the plot deepens when the woman is suddenly found dead.

It was the beginning of the night at midnight that Conan, Ran, and Kogoro have dinner at midnight. After the meal, Conan went to bed, and Ran asks him to brush his teeth before going to bed. She has now became suspicious that Conan is Shin'ichi. She went to the office to check on Conan's cellphone. Ran decided to check for mail in the phone so that she would know that Conan is Shinichi. She typed every pin code in the cellphone, but didn't work. Ran begins to remember what code Shinichi choose. Ran began to type the code 5545, but couldn't. She realized that Shinichi has to choose what code it is. After discovering that the mail isn't there, Ran decided to send it, but couldn't. Just then, she gets a call from Shinichi, who questions her why is she keep sending the mail over and over again. Rachel begins to forget that Conan is Shinichi. In Conan's room, it was revealed that he hides his real cellphone in the bucket.