ADDING UP TO FAMILY  Figures, not families, were her forte. Yet somehow CPA Katie WIlliams found herself accepting single dad Sam Millwright's desperate job offer to help care for his two young children. She took the job...temporarily. Because losing her heart to this love-starved family was definitely off the books.  Sam knew Katie was different from her first day on the job. In just a short while, the new nanny had coaxed a smile from his sullen daughter and got his silent son to speak. And she awakened a part of the widower's heart he'd long since locked away. Still, Katie planned to leave--and Sam knew if he stood any chance of convincing her to stay, he had to show the temporary nanny that they could have a permanent future...together!