Just finished reading this and how lovely to be able to have a chat with the author! I did enjoy the majority of it and raced through it. I felt a little deflated at towards the end as so much happened in the last 50 or so pages and I would have liked to have more dedicated to the discovery, the "event", the trail, and I would have liked to hear a little more about what happened to Jamie and kirsty in more detail before it was wrapped up. There was also part of me that would have enjoyed a short chapter or two from inside Lucy and Chris' flat not giving anything major away just a glimpse of their life.
sarah the way I interpreted it was that Jamie's relationships with everyone changed because of the strain of Chris and Lucy and the impacted they were having on his mental stability. With Paul it was partly down to his accident which is common with head injuries and partly due to Jamie no longer being as happy go lucky as he was at the start of the book, being more confrontational and desperate.