I loved the novel. Brandon, did you find the one deliberate editing "whoops" where the name of one character remained intact after all DS references were removed and changed? Despite fearing the wrath of you-know-who and his army of lawyers, it was a bone thrown to us DS fans (and probably caused those not familiar with the show to scratch their heads).
The ending went way off the bible, but it caused me to tear up.
I did catch the editing "mistake" and it actually made me do a double take and re-read that section because I was unsure if she was referring to a different character all together or if she were using a slip of the hand as a nod to DS.
The best part of the book were the flashbacks showing the relationship between the Willie/Jason characters (Jamie and Kellan in the book). Those provided a lot of character depth for Willie and Jason both, and I enjoyed imagining their relationship being as close as it was, though in the show it seemed to devolve very quickly thanks to Barnabas. I also thought that in the series Jason always came off at as Barnabas-lite, i.e. taking advantage of Willie and treating him more of a child than a cohort. In the book this was less pronounced, though still evident.
Louisa as Julia was a poor substitute, and if the book had remained DS oriented and the names not changed, I think the Julia character would've be wildly inaccurate in the book. At the very least, she would've broken character a couple of times.
Reading this book makes me wonder what other characters could've or would've been delved into deeper if this publishing line had continued.