Mission: Impossible to Protect by Jacki Delecki

She’s a nerd turned ninja…

Working as a top-secret biochemist, Danni Knorr was kidnapped and almost killed by terrorists who wanted her research. After narrowly escaping with her life, she vowed never to be a victim again. To confront her fears, Danni becomes the kind of woman no one dare mess with, learning martial arts and firearms. She’s traded in her lab coat for a holster, working as a kickass personal bodyguard for a famous rock star. But she’s in way over her head when she stumbles onto drug cartel business—business that could get her killed.

He’s a bad boy hiding a broken heart…

Lars Jenkins is the Spec. Ops Marine rescued Danni when she was kidnapped. In the months that have passed since then, he can’t get her out of his head. While she’s hot as hell, she is trouble with a capital T. The woman attracts danger like a magnet—a sexy magnet, which is why Lars stays away from her. He was hurt once and won’t allow it to happen again. But when a friend calls in a favor, Lars finds himself helping Danni once more and the chemistry between them is more explosive than ever.

Stuck together again, the two decide maybe mixing pleasure with business isn’t the worst thing that could happen. The worst thing would be getting killed by the drug cartel hunting them.