★Rights sold: Korean! Over 100,000 copies in print!
★Winner of the 2025 23rd "Kono Mystery ga Sugoi!" Award – Paperback Gold. A super-nova author serves up a "mansion-style" locked-room puzzle where every page is a trap.
★Legendary writer Maya Yanagida calls it "a novel whose greatest trick may be its own voice"—a must-re-read for every serious mystery fan.
★Focuses on the "medically death-sentenced", locked in a remote mountain villa; one bizarre death, endless twists, and a finale that leaves you gasping.

A secluded lodge that gathers the terminally ill. A sudden death. Natural causes—or murder? A super-nova author delivers a "mansion-style" mystery you will have to read twice.

Kunema, owner of a small detective agency, drives to a crumbling villa deep in the mountains with his assistant Ritsu. They have been invited as special guests to a private retreat for people who have been told they have only months to live. Dinner is shared, stories swapped, fragile friendships formed. At dawn one guest is found dead.

Accident? Disease? Or homicide? If it is murder, why kill someone whose clock is already running out? Kunema and Ritsu begin to pick apart the scene, the timeline, the survivors—until the final revelation snaps every assumption into place.