Note: I received this book from the author/publisher in exchange for an honest review. 
 I would have liked this book a lot more if I was smart enough to understand the physics and math that made up a good chunk of this book. I'm pretty ok at calculus so I sort of understood the equations but physics and I have never gotten along. I basically passed physics class relying on my way smarter lab partners and an excellent guessing strategy on tests. So all the parts of this book that dealt with the physics of time travel and wormholes and principles and exclusions just had me confused. So I'm not entirely sure I get how Gottie was time traveling, but I sure as heck enjoyed the fact that she was time traveling. The story is well written and very intriguing. I kept reading trying to piece together what happened in the past to influence the "now" and was really sucked in just trying to figure it all out. Again, if I understood physics better (even with the graphics and graphs included I was lost) I would probably have loved and fully understood the story more. But from what I understood, I liked this book and really had a nice time reading it.