Cant't get back into the Baron's Castle to help him kill the unborn son

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Cant't get back into the Baron's Castle to help him kill the unborn son

On the mission Family Matters, I came across the part of the quest where you have to kill the unborn sun. This part of the game for was me was too frustrating at the time and didn't want to do it. I just jumped over the wall basically and started a new quest. Now, I can't even get back into the castle, and even do the secondary quests that are involved up there. Everything is locked. Even the underwater passage is blocked off. What can I do? I really don't want to start a whole new game because I'm at a level 9 now, but what should I do?
 
There isn't one single place where you could climb over the wall and see what's happening inside?
 
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