It's very hard to write the fourth book in a series knowing that a large portion of the readers will not have read the second one. Due to a disastrously muddled release and the general perception of prequels as supplementary bonus material rather than true links in the narrative chain, THE NEW HUNGER has been skipped by many otherwise passionate fans of the Warm Bodies story. Other than the common question of "What's the deal with that little boy?" it doesn't have a huge impact on your understanding of THE BURNING WORLD. But it will be a very big deal in THE LIVING.
So I have this strange authorial conundrum. Which set of readers do I write for? How much do I try to cover that likely gap in the narrative, and will I even be able to tell what needs covering? A scene that feels powerful to me may ring hollow for the readers who skipped the events that led to it.
Normally I would say to hell with them. If they expect a story to work with a quarter of of it missing, they're lost. But since the obscurity of THE NEW HUNGER is partially my fault—confusing release strategy, failure of promotion, and unusual narrative significance placed on a prequel novella—I feel a bit more responsible to hold their hands.
I don't know how it will turn out. I'm trying to find a middle road. But if you'd like to solve this problem the easy way...may I recommend this very quick read?