This book took me forever to read. 2.5 maybe? 
 The world building had an interesting scientific twist - one of the reasons I wanted to read this book. It was a book with ordinary character in an ordinary world, where suddenly, Josie discovers that there is another world that looks exactly like hers and that world is even better, except it's not. 
 This book was very cliche in all of the other ways though. Especially that moment when she decides that she only needs Nick because she's in love with him? What about your parents? The fact that you have a better life than others..? Her real parents love her - and they're back together, she has a new best friend, and she's going to give *all* of that up for some person she met a a few days ago? The ending was kind of confusing. Or maybe I didn't read it right? 
 (view spoiler)[One thing it does have, though, is that the two of them can't be together - they're both stuck in separate universes. >:D A problem, that I'm sure, will be resolved in the later books, if there are any? (hide spoiler)] 
 In all, this was at most entertaining, with an interesting setting.