I just finished it and it was awesome. Totally unexpected and it took me somewhere where I didn't think this book would take me when I started reading. The Author is a screenwriter and it shows. The book has the television series structure where in the end of each chapter something shocking happens and changes everything. So it's a wild ride. And it's fast-paced especially towards the ending. You can't not fall in love with Samantha because she is such a trooper, a soldier actually, and she has an incredible will for life even though sometimes she thinks she doesn't really want to live but then she pulls it together and just keeps on fighting. A lot of shit happens to her but I'm not gonna disclose it. It's a part of the ride.
I totally enjoyed it and recommend it to people who love twists and turns and who doesn't like predictable plots, also the science-fiction element here is well-defined and pretty unique.