This is just not my thing at all. It's probably well-written for the style, but not in a style I enjoy (dual third person, which is weird style; I'd prefer either dual first for more traditional third person like Sarah Rees Brennan uses). I ended up skipping ahead, hoping it just was off to a tedious start, but it never worked for me. I was also bothered by the way one character was treated, as others have been as well. I also did not finish Myracle's Shine, so I suspect her style is just not for me, though I know others love her work. Finally, this seemed a bit like a retelling/modernization of Forever (is it supported to be?) in a way that felt too derivative to me. My ARC had a letter from the author (I usually enjoy reading these), which had a tone that really started this book off on a wrong foot for me, so I'm sure that tinged my enjoyment as well. Finally, I was very troubled by (view spoiler)[the weird "no condoms" thing which did nothing for the story. Yes, Wren goes on the pill and Charlie gets tested for STDs, and I guess this is Myracle saying that safe sex is important. But, I critique adult fiction for this all the time, and YA doesn't get a pass at all. I simply can't deal with the weird anti-condom narrative that's so common in fiction these days. I guess it's because I was a teen/college student in the 90s, when condom usage was burned into our brains. I realize that's changed a lot and I don't think that's a good thing. (hide spoiler)] 
 This book already has legions of fans, so it's likely that your results may vary. 
 I wrote about this book in the context of feminism and how it handles sex on Clear Eyes, Full Shelves - http://cleareyesfullshelves.com/blog/...