A Way's Destination

You travel with a Way that you've never used before, hoping to end up at the Library.
You end up in a small room instead, with empty bookshelves lining the walls, before you noticed a small sticky note attached to one of them.
You peel off the sticky note and look its contents. A hastily scribbled note looks back.

These shelves are empty, but not for any longer. Maybe you should come back later?