When Mouri is hired to protect the aging company president Tatsua, he, Ran, and Conan arrive at her house to find out that her son Kouji, daughter Etsuko, and maid Azusa were all in debt, a problem Tatsua would not help with. When Etsuko went to Tatsua's room to check on her, they all heard a gunshot. Mouri and Kouji broke down the door to find Tatsua dead. When the police investigated, they found Tatsua facing her open window, meaning whoever shot her probably knew her. They also found her TV remote under her table, but what does that mean when the people in her house all have alibis?