Master Sergeant Chris Hall's party-hard days are behind him; he's become the perfect Air Force aircraft maintainer, earning quick promotions. Although the life of a rising star is lonely, he'd rather embrace his lone-wolf reputation, because it's safer than jeopardizing his heart.

After a series of disappointing relationships, intelligence expert Major Amy Stone hides behind her "Stone Cold" call sign, giving up on dating, and concentrating on her career. Rex, her loyal German Shepherd, is the only guy Amy needs.

On a solo hiking trip, Chris finds an unconscious Amy and her snarling dog. When weather moves in, Chris's quick thinking saves their lives and sparks an instant attraction. After their adventure, their connection grows, despite the risks of a forbidden relationship and the danger to their guarded emotions. When a threat from Amy's past returns, not only are their hearts and careers in danger, but possibly their lives.