魍魎の匣 by Natsuhiko Kyogoku

A dark, multi‑perspective mystery set in mid‑20th‑century Japan in which writers, detectives and doctors become entangled in a baffling string of disappearances and grotesque deaths; blending forensic detail, psychological depth and elements of folktale and superstition, the narrative peels back layers of obsession, familial secrets and social decay as it probes the uneasy border between rational explanation and the uncanny.