A thrilling mystery novel skillfully written by Akimitsu Takagi. The great detective Kyosuke Kozue appears again, searching for the truth behind the incident amidst a swirl of conspiracies and betrayals. The complex web of human relationships and psychological battles will keep you hooked until the very end. In particular, the suspenseful development surrounding the identity of the informant is overwhelming, and once you start reading, you won't be able to stop turning the pages.