They leave things behind sometimes, the guests. A bottle of scent. A crumpled handkerchief. A pearl button that fell off a dress and rolled under a bed. And sometimes they leave other sorts of things. Things you can't see. A sigh trapped in a corner. Memories tangled in the curtains. A sob fluttering against the windowpane like a bird that flew in and can't get back out. I can feel these things. They dart and crouch and whisper.