I'm sure this has been around before, but is there really supposed to be 3 copies of the 'Final Journal of Jonas' book? Seems pretty weird as it's a "personal" item and not a published book (I would assume). You can find one in Tryggvil's house and 2 down in the Skaenite dungeon.

Do they have a story inside? Can you read them like all those books in so many crpgs?

I found all three in my last BB playthrough as well - all of them, you could read, just like a book, but obviously shorter, like a page or so in alles. 

This is actually a lore book commonly reproduced by Skaenites and not an individual's personal journal. I hope that clears things up a bit.

Thanks cRichards!