In the pouring rain, Conan and the Detective Boys stop by a mansion in the woods to borrow their bathroom. After speaking with the men "Bro" and "Skinny" at the mansion, he realizes they're not the mansion's residents, but robbers. While running from the two robbers armed with knives, the Detective Boys rescue Amamiya Maki, the bound resident of the mansion. Conan and his friends flee throughout the mansion with Maki, who doesn't know where her husband is. Later, as Conan and his friends attempt to escape the mansion, they spot a pool of blood through an open doorway...