Well, this series ended on the same note as it started. Flat characters, no development. I will say in this book that the author really impressed me with the depth of her research into viruses and how much explanation she provided for them. However, I wish she had expended that effort into the rest of the story. Again we see things happening and characters "falling in love" and signs being shared and given with no description of how we got there or how the character knew something or convincing development to that point. And seriously, worst dialogue and inner thoughts conversations of almost any book I've ever read. I really wonder how the author never noticed that people DO NOT talk like that. Also, we still have no clue who the heck the Enemy is or was. They are mentioned all the time for plot assistance but never explained. And there were a pretty good chunk of loose ends...like what was Xander's memory when he took the red pill and didn't forget that he wouldn't talk about? It seemed important and then was completely dropped. I do appreciate also that characters died. It wasn't written well enough that I actually cared, but it was more realistic that way. All in all, sub-par.