Perfect Witness by Katie Mettner

She’s the key to the whole case. All he has to do is keep her alive to testify.

Protecting the key witness in a high-profile trial is security expert Cal Newfellow’s top priority. But keeping Marlise alive becomes a test of courage and will when they’re attacked and forced into hiding. Battered but not broken, Marlise also has a mission: to put a dangerous criminal behind bars forever. That means trusting a man battling his own demons. The man sworn to help her heal...and survive.