Shichiri Nakayama is a prolific author of crime fiction. ใๅใ่ฃใใธใฃใใฏใฎๅ็ฝใis the first novel to introduce the police detective Hayato Inukai (็ฌ้ค้ผไบบ). Setting The novel is exactly about what its title refers to: a serial killer who calls himself "Jack", murders similar to those of Jack the Ripper, a police investigation to find the killer. But..