「先ほどの手紙は『人間椅子』という創作小説の下書きです」というネタばらしと、虚構と現実の境界を揺さぶる点

Just as Yoshiko leaped away from the chair in terror, another letter arrived. Opening it, it read: 'The long manuscript I sent you earlier is merely a draft of a creative novel called 'The Human Chair' that I recently wrote. I apologize for surprising you.' It is an exquisite conclusion of Ranpo's sharp-witted suspense, beautifully shaking the boundary between real nightmare and fiction.