Trying to skip out on Christmas, Ali turns to work during the holidays. After running into her ex and his new girlfriend, Ali starts to think about her past and how things might have gone differently had she not broken up with him a year before on Christmas Eve. Upon meeting a kind stranger at a diner, who encourages Ali to believe in the magic of the holidays, Ali admits that she would redo last Christmas if she could. The next morning, she wakes to realize that her second chance has come true but changing history is no easy task, and Ali has her hands full trying to navigate every decision to make sure that this time around she ends up with the love of her life.