Loyal Hearts by Danielle Stewart

Harlan Kalling can shake any security detail her over-protective brothers assign. It is the only thing she’s good at lately. A string of bad luck and worse choices has her believing rock bottom is her new normal. But when one determined agent decides he’s not letting her give him the slip a seductive game of cat and mouse begins. Dallas Rockland doesn’t fail. When assigned to guard his friend’s sexy but stubborn sister he’s determined to protect her, no matter how difficult she makes it. The only challenge: keeping his head in the game when she’s standing close enough to touch.

As the heat of attraction begins to smolder between Harlan and Dallas, she soon finds there might be something worse than hitting rock bottom. Flying so high that when it ends, the fall may kill her, but only if the danger nipping at their heels doesn’t get her first.