Long After Midnight by Iris Johansen

Kate Denby is on the run from a cold-blooded killer. A research scientist close to a breakthrough on a project that could revolutionize the health industry, she is unwillingly caught up in a web of danger, intrigue and murder. The stakes are high with her mother-in-law and son's life in jeopardy. Kate is forced to combine her scientific studies with Noah Smith, a scientist whose ideals match her own. But she must place her own safety and that of her son's in the hands of Seth Drakin, a man who incites her heart more than her trust. A suspenseful, well-crafted story.