The premise of this book is GREAT--something is happening to the sun. We can't control or change it, and the impact of the solar changes is traumatic in the extreme.
Unfortunately, I personally found the book a chore to read all the way through. I've been struggling to finish it for weeks now, and finally got done with it. I have some problems with it that are pretty fundamental. First, I didn't much care about or believe in their obsessions. Some of these obsessions seemed both unjustified and a little odd.
Another issue I had was that the science to me did not make a lot sense. The concept of the level of science that lead character Emily was doing in the conditions under which she was doing it and the sheer speed with which she leaped to conclusions on the basis of limited (almost no) evidence...just insane.
The rationale for the fighting and attacks in the last half of the book also didn't make a lot of sense to me. There were huge...and I mean HUGE...leaps of logic in this story that just didn't track for me.
Overall, I think this story could have been fabulous. Unfortunately, the story logic and characters as written were just not very believable or even (in the case of the characters) not very interesting.