I've enjoyed the whole of this trilogy and Evolution didn't disappoint as it brought the whole thing to an end. The science has been quite grounded through the first two books, considering the subject matter. I felt like Evolution took it a little further 'out there' at times, but I think it worked within the story and worked as an explanation for the sickness that's been affecting people in different ways. The POV characters took quite a surprising turn. I definitely missed one of my favourite voices from the earlier two novels, but it played out really effectively. Each POV character got a fair amount of attention, and it never felt like I was being directed away from what I wanted to see. One of my favourite elements of Teri Terry's writing is the moral complexity and ambiguity, and this was better than ever in Evolution. It was so hard to tell who was right and who was wrong, or even if there was a right or a wrong. Yet despite this complexity, there was a clear bad guy, and a clear heroine. I just wasn't sure how much I agreed or disagreed with their motivations and actions. This grey area makes this trilogy a fascinating one.