The Chemist by Stephenie Meyer

Here's the summary from Goodreads

She used to work for the U.S. government, but very few people ever knew that. An expert in her field, she was one of the darkest secrets of an agency so clandestine it doesn’t even have a name. And when they decided she was a liability, they came for her without warning.

Now, she rarely stays in the same place or uses the same name for long. They’ve killed the only other person she trusted, but something she knows still poses a threat. They want her dead, and soon.

When her former handler offers her a way out, she realizes it’s her only chance to erase the giant target on her back. But it means taking one last job for her ex-employers. To her horror, the information she acquires only makes her situation more dangerous.

Resolving to meet the threat head-on, she prepares for the toughest fight of her life but finds herself falling for a man who can only complicate her likelihood of survival. As she sees her choices being rapidly whittled down, she must apply her unique talents in ways she never dreamed of.

I really like the way Stephenie Meyer writes, and I've liked both the Twilight saga and The Host (sue me). So, of course I had to read her newest book. And this suspense book deviates from her previous dabs with the supernatural because there is no supernatural. In this book we have a regular girl with a nondescript appearance (as told by herself) who happens to be a genius. She was part of a hush hush part of the government, who decided to eliminate her and her mentor because they know something someone doesn't want them to know. 
She's been on the run for years, taking many preventions from being killed and living in total paranoia. Then she receives an email from a member of the department where she worked, where he claims they need her, because only she can stop a massive world-scale crisis from happening. And one of the causes is a common school teacher, called Daniel, whom she has to interrogate. And things happen, I'm not spoiling anything, but it's really exciting. 
First, I love that the lead is an ethnically ambiguous girl with no physical prowess, whose ultimate weapon is her brain. And that the romantic interest is like "Okay, she's leagues smarter than I am, and that's really cool". I could do with more of that. Also, her general self doesn't change when she falls in love. If anything, I find her panic upon the idea of love and feelings to be quite refreshing, and that the romantic interest is the one who gushes the poetic romantic stuff. Yes, the guy is the romantic one, and I love that. Also, he cooks. Give him a medal, please. 
Added to a refreshing couple you have conspiracies, the general mystery of not knowing what's going on but the nagging need of finding out, general adventure and fear, and guns and fire and poisons. 

In conclusion, this book successfully managed to keep me awake making theories of what happens next, and that level of attachment with a story is what I look for in a book to make it a 5 star read. I really recommend this book, you'll likely not regret it.