I am not a huge Batman fan. When I read Batman, I read him for Catwoman, the Huntress, Batwoman, or Batgirl. I say this because if this hadn’t been free, I would not have read it.
I can’t tell if it is a good adaptation of the novel or not, but since the creators are the same, I suppose it is. I like the idea of Nightwalkers and how they tie into Batman himself, but I found the story to be meh.