Your heroine is stranded in a blizzard. She is rescued by a man who has some struggles of his own – you decide what they are and how they impact the story. (For example, maybe his wife died five years ago on Christmas and he dislikes the holiday.) He takes your heroine to his home to keep her safe during the blizzard and the spirit of Christmas takes over from there.
What happens? How do these two find their way to each other?