How do you get out of Dead Man's Respite?

When you enter Dead Mans Respite you are welcomed by a ghost bard that presumably wrote Olaf's verse. When you follow the bard through the dungeon he will lead you up to a sealed door and will go to the right of that door, eventually you will find the book. Now, walk back to the sealed door.

After this, there will be a backdoor out which you will need to activate through a chain on the wall, tracing back to the entrance tomb of the dungeon.