Hannah Martin spent majority of her early life living in different cities just to end up back in L.A (where she is originally from). As she settles down in L.A she reunites with her high school sweetheart and couldn't decide if she wanted to give a chance to be with him or not. And so this one decision splits the novel into two parallel universes that lead to different end results. 
 I thought this book was interesting but repetitive. Once you find out what happened in one universe, you knew it was going to happen in the other one but it was just going to be told slightly differently and in a different time frame. But overall, I enjoyed it but I think it would be more interesting if there were more differences between the parallel universe.