The story of "A Christmas Carol" is about a grumpy and selfish man named Ebenezer Scrooge who is visited by three ghosts on Christmas Eve. The ghosts show him the past, present, and future in an attempt to change his selfish ways and bring him back to the true spirit of Christmas. In the end, Scrooge's heart is touched by the ghosts and he realizes the error of his ways, becoming a generous and kind man. The story is a reminder of the importance of being generous and kind to others, especially during the holiday season.