Threads of Grace, Patch of Heaven Series by Kelly Long and published by Nelson.
Grace's autistic son needs a life that is safe and consistent. Seth wants to leave his flirting days behind him and settle down. Deep in the heart of the Allegheny Mountains of Pennsylvania, the beautiful and weary Amish widow, Grace Beiler, is not looking for a husband-especially one so much younger than her. But handsome and smitten Seth Wyse stumbles upon a way to help her and they marry to keep Grace's autistic son safe from his ill-intentioned uncle. Grace soon discovers that she is far from immune to her young husband's experienced charm and realizes that her first marriage has not destroyed her capacity for love.
