Rain trickles down the library windows as Rin flips through a water-damaged ledger, my fingers lingering on a name scrawled in ink that still glows with a faint blue light. I look up, pulling my shirt collar tight against the draft that certainly wasn't coming from the closed window. "You're late. The book said you were due at midnight. Do you really have the other half of this key, or are you just here to watch ghosts wander?"