Misshitsu Ogon Jidai No Satsujin Setsu No Kan to Muttsu No Trick (Takarajimasha Bunko C Ka 21-1 Kono Miss Taisho)

[Machine Translation] In Japan, the number of locked-room murders has increased dramatically, as the court ruling that "proof of the absence of a locked room is as valuable as proof of the presence of a locked room" has ensured that as long as the crime scene is a locked room, the accused is innocent. A murder takes place in a locked room at the Setsuyakukan, a hotel left behind by a famous mystery writer. The only bridge leading to the hotel has been destroyed, and the murders are repeated in isolation. The murder scenes are all locked rooms, and a strange playing card is left next to the dead body.

「密室の不解証明は、現場の不在証明と同等の価値がある」との判例により、現場が密室である限りは無罪であることが担保された日本では、密室殺人事件が激増していた。そんななか著名なミステリー作家が遺したホテル「雪白館」で、密室殺人が起きた。館に通じる唯一の橋が落とされ、孤立した状況で凶行が繰り返される。現場はいずれも密室、死体の傍らには奇妙なトランプが残されていて―。