The first novel by the classic Japanese detective Seishi Yokomizo is recognized in his homeland as the best “locked room” mystery in national literature. In it, for the first time, the regular character Yokomizo appears - amateur detective Kosuke Kindaichi, unraveling the mystery of an ingenious murder committed in a locked room, surrounded by untouched snow and a wall with a locked gate. An amateur translation made from an English translation published in 2019 through the efforts of members of the Amateur Club forum detectives."