A real estate company president named Bunz? Ushio mistaken an ulcer for cancer and paid an assassin nicknamed Fox to assassinate him. Now that he realized his mistake, he asks Kogoro to find Fox because he lost contact and is unable to stop the assassination. Bunz? explains the agreement includes that Fox will only target him while he's traversing, so Richard, Rachel, and Conan head to Tanbara mountain to traverse with Bunz?. Along the way up, the guide is murdered and Kogoro is attacked during the night when the group stays in a cabin on top of the mountain. One person is missing at night, but only because he's claustrophobic. When Richard and Conan head back to the cabin, they hear Rachel's shriek.