The Chemist 

She used to work for the U.S. government, but very few people eve expert in her field, she was part 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. Something she knows still poses a threat. They want her dead, and soon. When her former handler offers her a way out, she realises it's her only chance to erase the giant target on her back. But it means taking on one last job. To her horror, the information she acquires makes her situation more dangerous. Preparing for the toughest fight of her life, she finds herself falling for a man who can only complicate her likelihood of survival. With her choices dwindling, she must apply her unique talents in ways she never dreamed of.