A post on a strange-tales forum and a bizarre mobile app drag Lin Xun into an unfathomable abyss. A game of hide-and-seek at an abandoned school ends in death, yet he wakes up on the cold classroom floor with his body changed in a horrifying, irreversible way. What are ghosts? What is the app? What secrets lie behind the copper coin from the incense shop and the ruined Taoist temple on the mountaintop? The countdown to his next mission has begun, and the terror he unleashed is quietly spreading into the real world…
