"Tick-tock, tick-tock!" There was only one rule, written on a yellowed piece of paper behind the reading room door. Red ink dripped onto the floor like dried blood. The paper read: "No matter what you hear or see, never let your eyes be filled with nothing but the sky!!!" My name is Lin Mo. I woke up slumped over a long table in the university library. The sky outside was a deathly gray, like a layer of dirty glass. My phone screen was shattered; the time on my phone was frozen at 3:14 PM. There wasn't a single bar of signal. I looked around blankly. Besides me, everyone else in the reading room...