After Defeating Miraak...?
Ok, so I completed the whole defeating the original dragonborn, Miraak, but when I went to read the book to get back to Solstheim, it keeps saying "You can't concentrate on what you are reading". In the end I just got myself killed and went back that way instead, where I was able to complete the quest.
I'm pretty sure it's supposed to take me back, though, via the book. So I'm thinking I missed something out. Any help?