There is a place north of Morthal called "Abandoned Shack". There is blood on the door as if there was some sort of skirmish or battle there. I can't get inside because it requires a key. The only problem is that I can't find a key anywhere. There is a boat nearby but no key is inside. I've even wandered into Morthal hoping someone will mention this shack and give me a clue or the key...but no luck. I'm truly mystified. Help??