This book. This book! THIS BOOK!!!
Warning: possible minor spoilers ahead.
I was onboard from the first page, where Mila and Lucas were hiding out in a quiet cabin in the mountains. A little after that, I admit I felt the story started dragging a bit, feeling a sense of deja vu for a good chunk (except with Lucas instead of Hunter, and different people they were looking for answers from), but then once the gang got together, I was SO onboard again!
I really liked the relationship between Mila and Lucas; it was sweet, but still different than that between her and Hunter. I also just really liked the relationships between the different characters in general. The tensions and differences between how certain characters viewed things, and how relationships changed and developed, kept things realistic and interesting.
I LOVED the mystery that came about surrounding the prep school; it had a sense of first-book mysteriousness that I really liked (as in, I could easily see it being the central plot of its own first book). It kept the story fresh and new, even though it was halfway through the third book.
While I became really attached to the main characters, I wish we'd had a little more time with some of the supporting characters. I liked them, but didn't feel a strong connection with any of them. There were also a few continuity errors that annoyed me, in addition to some technical details and connections made that I didn't feel were explained clearly enough (though the latter is highly possibly due to me not taking enough time to stop and think about it to make sure I understood).
And then that foreshadowing. Yeah, that. Fantastically done. Maybe I'm blind, but I totally didn't pick up on that until after it happened. I mean...as the climax was going, I started anticipating what was going to happen, but I didn't make the connection between that and the foreshadowing until afterwards.
Then...the ending. I don't often cry in books. I will often get teary-eyed, sometimes enough for one or two tears to fall, but actual crying is pretty seldom. Despite the fact that I knew what was coming, I cried. The android with a heart...it is definitely thought-provoking, and I will be thinking about this for a long time to come.