Near the train station, Conan and Ran encounter Higuchi Masaki, who is looking for his missing wife. Believing that something may have happened to her, Conand Kogoro begin questioning people in Higuchi's neighborhood. Though they find few witnesses, the ones they do claim to have heard the couple arguing and screaming disturbing things at each other, such as, "Kill me tomorrow!"

Kogoro is hired to serve as a bodyguard for the president of an investment company. When he and Conan go to check things out, they discover that his investments are a scam. As Kogoro turns down the job and begins heading home, someone discovers the body of the president, and...