Prefecture D (陰の季節[1], Kage no Kisetsu, "Season of Shadows") is a 1998 novella collection by Hideo Yokoyama, published by Bungeishunju.
The English translation, by Jonathan Lloyd-Davies, was published by the MCD imprint of Farrar, Straus and Giroux in 2020.
Paul Sedan of The Christian Science Monitor argued that it would likely be "one in a mountainous location in the middle of the country.
"[2] They focus more on day-to-day business of the police agency of that fictional prefecture, including personal conflicts.
"[2] Publishers Weekly stated that the book is "disappointing", arguing that the resolutions "are largely anticlimactic" and that the characters are not "memorable".