The dark brotherhood know too much about you. When you do the quest to kill the guy from the begining in the jail, he starts saying "You should know the way.HAHHAAH" Where did they find all this out? I dont get that.
unfortunatly, i didnt get that sweet revenge.... i ran in with my ***spoilergraycowlofnocturnalspoiler***, ran like hell past all the guards, whacked him, and ran like hell out... scot free