Arrive like some hallway mail

thud rustle

You notice a piece of paper sliding across the floor, coming to a stop at your feet. It's a plain white envelope with your name scribbled on it in messy handwriting. The flap is open, and a small note falls out:

"Hey, I heard you're looking for something. Meet me in the old clock tower at midnight. Come alone. -A friend"

The note is unsigned, but it seems to be addressed to you specifically. What do you do?