Regan Black & Debra Webb 
Her Undercover Defender [EPUB ebook] 

She’s the perfect pawn Covert CIA specialist David Martin has his orders. Keep a terrorist cell from using Terri Barnhart as leverage to get their hands on a nearly perfected bio-tech weapon. Falling for her could compromise his mission and turn the dedicated nurse into a moving target.With her brother off the radar for three months, Terri fears the worst. Having the sexy southerner to lean on helps-except the hospital’s new staff member isn’t what he seems. To survive, she’ll have to trust David with her life-trusting him with her heart is something else entirely.