During a visit to Tottori, Kogoro, Conan, and Ran come across a case. Shuko, wife of the Kumado family's eldest son, had her hands and feet bound by a robber, and the family's heirloom incense burner was stolen. A pedant found at the crime scene casts suspicion on the family's former housekeeper Naomi, but Kogoro and his family saw her at the sand museum at the time of the crime. Later, head of the household Kumado Isao receives an e-mail on his phone demanding 10 million yen in exchange for the incense burner. Kogoro suspects the crime was committed by a family member who was trying to frame Naomi, and investigates the alibis of Isao, eldest daughter Makie, eldest son Soichi, and second son Junji, but...