The Sweet Voice Heard Through the Phone The Mori Detective Agency receives a call from a client, Mayako Nagamine. Mayako was supposed to come to the office, but she seems to be lost. It was past the scheduled time, but Kogoro was thrilled, knowing that Mayako is a beautiful woman after checking her photo on Instagram. Mayako married Haruhiko Nagamine, her boss at work, a year ago. She is now a full-time housewife. Listening to the phone call, Conan assumed that he was supposed to investigate Haruhiko, who is constantly rumored to be having an affair. However, she was told that the request was to investigate Haruhiko's possible involvement in a crime. Mayako saw Haruhiko bring in a suitcase in the middle of the night and hide it in the garage. She tried to check inside, but was unable to open it because it was locked, and the fact that it was unnaturally heavy made her suspicious...