Once a Killer by Margaret Watson

Bree Gordon looks nothing like a bodyguard. But the short, slender woman knows how to keep her principal safe. And one of her most potent weapons is her appearance. People see her and dismiss her. Their mistake.
Jameson Ford is a technical whiz who’s working on a program that’ll be a game changer. The military wants it. So does the CIA, along with some unsavory players. Someone close to him wants it, as well – one of the engineers in his lab.
When he reluctantly hires a bodyguard, he’s shocked when Bree shows up. But it doesn’t take long for him to appreciate her abilities. Will the attraction flaring between them be their salvation? Or will it be their downfall?