Duncan Wilde has avoided long-term relationships very well since his fianc e left him wounded in the hospital years ago. That one harsh lesson-that he needed to guard his heart-has stuck with him for years. Besides, he's a beat up old Marine well past his time for love. The fiery-haired doctor from Kansas City seems to think otherwise, though. Too bad she's so damn young.Alex Hartfield grew up as a military brat, but she sees something in Duncan that...