High-powered event planner Hayley Parker joins her sister Amy, her husband Tim and Amy's in-laws for what she thinks is a quiet Christmas in the mountains, only to find that Tim's globetrotting brother Paul, who Hayley blames for making her ex break up with her, will be there with them. To keep the peace, Amy begs Hayley to behave, and she does - and begins to fall for Paul in the process.