** spoiler alert ** 
 I did not like the first half of this book. A lot of it was just frustrating reactions or non-reactions: How could Eve take so long to realize that her leg was healed, when even I knew it had somehow magically healed and it's not even attached to my body? Could there have been any more heavy-handed hints about that? And yeah, I get that the whole genetic creations thing is questionably moral, but her reaction to the photos of the creatures made me roll my eyes so hard I think I hurt my neck. A green pig and a kid with a face on her back are weird, but I don't think they're heartstoppingly horrifying "my mom is a monster OMG CALL THE POLICE!!!"-level weird. It does not warrant a full-on panic attack and flip-out like that. Also, Eve's entire reaction to her supernatural healing ability was so incorrect it made me a little angry. Be a little grateful for something GOOD, you spoiled little brat. Jesus. Even without your consent, seriously, it's a good thing. I fail to see how there are any downsides to never getting sick or healing lightning fast form injuries. 
 And small point, but how the hell do you pronounce "Aislin"? It sounds dumb any way I try to say it. Why can't these people have normal names? 
 Part of my problem is that the whole "building Adam's genome" storyline was a little boring to me. Not that I don't like science, necessarily, but there was a LOT of blah-blah about basic genetics, which was a little elementary and didn't seem integral to the plot. 
 But then the second half of the book picked up, and I got a lot more interested. The little twists and unexpected actions from some of the characters got me a lot more interesting, and the whole thing started to feel more real to me. I liked that Eve and her mom connected a little bit, and it was a nice surprise to see Aislin get with Adam (although in hindsight, maybe it was a bit predictable what with the love triangle -- still). It was a great way to show Eve's growth and also comment on the idea of perfection, without being as overhanded as it was during the Adam construction scenes. 
 So, 2 stars for the first half, but 4 stars for the second half. I don't know if I'll read any other entries if this is a series, though.