Kisses from the Heart by Carole McKee

Mindi loves her life in the country, where she works out of her home. She is a pretty contempory young woman who is fun-loving and feisty, without a worry in the world--until the night of the storm. Lightning streaks across he sky, thunder shakes the earth, a deluge of rain soaks the earth, and a prison bus overturns in a swollen creek. The prisoners escape and one of them is in her house! She is terrified but her terror is soon replaced by love and Mindi's life will never be the same.