One Starry Christmas: Aspiring astronomy professor and Christmas enthusiast Holly is crushed when her longtime boyfriend Adam schedules a business trip and leaves her alone over the holidays. When she decides to surprise both Adam and her parents with a Christmas visit, however, fate, or perhaps the Christmas spirit, intervenes. Holly's bumpy holiday travel makes a turn onto the road to romance when she and her bus companion, Luke, forge an instant connection over their love of constellations and Christmas.