I really wanted to love this book and at the beginning I was pulled in with the characters stumbling across something that hadn't even been invented yet. Josh and Emma are likeable enough but I didn't feel much chemistry between them. It was totally believable on their reactions to finding out about themselves and even their attempts to 'change' the future. I did find some of the pop references off, which did take me out of the story a few times. What did pull me back in was the snowball effect of Josh and Emma in either trying to accept their so-called destiny or trying to change it. I really liked how Emma decides to take matters into her own hands even when the outcome might not turn out the way she'd hoped.
An interesting read with a big twist on the whole 'What if' scenario.
Fun time travel idea
Believable way characters deal with issue