Ran sends a message to Shinichi's phone only to find Conan's phone has also received the message causing her to suspect Conan of being Shinichi. A woman named Tomoko Kiriya hires Kogoro to search for her cellphone which contains messages of her affair. She attempted to call her phone and someone always hangs it up. She suspects that her either her father-in-law, brother-in-law, or husband has her phone. After questioning the three, Tomoko calls her phone and finds it and sends Kogoro away. While heading home, Conan learns from the news that Tomoko was found dead in her car after being stabbed and bludgeoned. Kogoro, Ran, and Conan return to the Kiriya home with the police to investigate. The three have established alibis: The father was heard behind the sh?ji, the brother's shadow was seen by the sh?ji, and the husband's pipe smoking was smelt. After ruling out the man having an affair with Tomoko, the police's investigation leads them to believe the case is somehow related to a murder twelve years ago which was done by Eisuke Kiriya, the third family son who disappeared after being suspected for the murder of his fiancée.