The annual Christmas program of Mount Saint Helen's Convent takes place in the convent basement. Following the opening song, Christmas Time is Nunsense Time, the program is to include an original ballet based on the "Nutcracker" featuring Sister Mary Leo as the Sugar Plum Fairy. Unfortunately before Sister Leo makes her grand entrance she is hit in the shin by one of the children's batons. What to do? As if there weren't already enough to deal with, word comes that the gifts under the convent Christmas tree have been stolen.