Board Thread:Roleplaying/@comment-2165692-20180514171731/@comment-2165692-20180515211148

Serana thougth "Are you sure he's there? He did leave the castle before us, he might not be there anymore. But it's difficult to know where he would be otherwise, we could ask the keeper if he's inside. Then we eon't have to enter the Castle itself."

(Keeper is the dude who yells "Lady Serana is back, open the gate." at the start of the questline, he's not there the rest of the game but he'll be there this time.)