Emma is a wedding planner in California. Suddenly, her half-sister in England reaches out, announcing that she is getting married at Christmas in two weeks. She wants Emma to be there and preferably help with the wedding. Emma travels to England for the first time to do so, also hoping to establish business contacts there. She is put to work on the wedding, where she is assisted by Dylan, Emma's sister's business partner and also the best friend of the groom.
The movie is good because it is a bit deeper than usual with complicated family relationships, etc. It probably would have gotten a 5-star rating if they hadn't botched the ending, which feels very abrupt.