I have loved reading books 1 to 4 and look fwd to the continuation.
Just a couple of things - main one being Brett. I'm getting a little tired of his inability to learn. They break up to try to enter the castle and he and Batfish get in. They then calmly proceed to sit down, chat and eat whilst the others are outside fighting zombies/possibily being eaten - really?
Then he couldn't dispose of Maddie on two occasions.
This was compounded at the end by his sitting in a pub (having not secured their entrance/exit route), on watch, and deliberately getting drunk despite a mortal threat from some Neds.
I could go on.
There has to be a better way to generate thrills than eventually wishing Brett dead so that a more intelligent character takes over. Maybe Smith could put him out of his misery and a maturing Jimmy could take his place.
Brett could have wounded Maddie to slow down the Zombies and watch her suffer for her actions. Creative torture - she got off too lightly. As for the Neds, the suspense could have been created from his alertness rather than his stupidity.
It would be good to see the characters evolve to take on a more dynamic role otherwise its same old, same old of bad/stupid decisions followed by getting out of the shit again.