Dr. Ree Ryland is an engineering professor who loves her job and plays by the rules. Her life is reassuringly predictable - until an enemy hiding in plain sight decides her squeaky-clean reputation is the perfect cover to commit a crime.When Agent Parker Landon and his FBI team discover that someone at the university has been procuring military-grade hardware by disguising it as test equipment, all evidence points to Ree. After the FBI intercepts a shipment that puts Ree in the clear, Parker is forced to tell her that she's being used as a pawn by an unseen enemy. And now she's in that enemy's crosshairs. Ree turns down the protective detail offered by the FBI and insists on using her inside knowledge to help with the investigation. Parker is leery of bringing a civilian on to the team, but he's surprised at how much fun he has working with Ree, even as he tries to keep her out of harm's way.Parker, Ree and the FBI team find increasingly worrying evidence that someone is quietly acquiring everything they need to cause destruction on a massive scale. Now, they must uncover the motive and identity of the killer hiding among Ree's friends and colleagues before it's too late.