I literally tore through this book in a matter of hours. Asher and Mackler write so seamlessly it's pretty much impossible to tell that there were two authors of this book. I loved the fact that the chapters were short -- this kept me want to keep reading. Also, I simply had to know what happened next to Emma and Josh, their friends, family and classmates. As I said before, a lot of the issues of time travel are addressed -- Emma finds out something about their friend Kellan that she struggles with, as far as whether to try to prevent it from happening. The knowledge of who they are supposed to end up with affects both Josh's and Emma's actions and decisions in the present... 
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