At Christmas time, Brittany-Ann's Mom convinces the City to cut down the tree house and put up a tennis court. Horrified BG and her friends try to sell Brittany-Ann on the idea of keeping the tree house by inviting her up to play with them, so that she will convince her Mom to save it. But the plan backfires, until BG learns that the unexpected support of a community on Christmas Eve can save the tree.