Black Forest Castle

You wake up in an uninviting room with the foreboding feeling that something is lingering outside... You recall a dark figure stalking you the night before... No, it must have been your mind playing games with you. You remember tightly closing and locking the door before resting. The key is no longer in the keyhole and the door appears unlocked. Who, or what, could have gotten through from the other side? Is something after you?