Tall Dark Defender (Silhouette Romantic Suspense Series #1566) by Beth Cornelison
Undercover investigator Jonah Devereaux barely knew Annie Compton, but that didn't stop him from nearly blowing his cover to save the pretty waitress from a ruthless killer. Convincing the stubborn single mom that she needed his protection 24/7 was a fiery battle of wills, but fighting his burning desire to make love to her was a war he wasn't sure he couldor wanted towin.
Annie didn't like a mysterious man keeping watch over her, especially one as dangerously attractive as Jonah. But she'd do anything to keep her family alive, even if it meant giving in to her temporary bodyguard's demands regarding her safety
and her heart.