Akuma ga Hisomu Shiro

Londoner Rosa visits an island off Scotland to meet a famous author, Liam Jameson, because she was told that her missing sister would be with Liam. Feeling at a loss on a strange island, the handsome man she conversed with on a ferry approaches her. He says, "I will take you to Kilfoil Castle where Liam lives." He says his name is Luther Killian. But Rosa has no idea that his name is the main character of Liam's novel.