Nancy Drew meets another Carolyne Keene creation, the Dana Girls, for the first time ever! Nancy and her pals visit the Starhurst School for Girls. Once students hear that the famed Girl Detective has arrived, they insist that Nancy meet Louise and Jean Dana, the Dana Girls! Soon, a good-natured contest is put together to see who the best mystery-solver really is, and it's in the form of a musical, complete with clues planted throughout the school. There's only one complication: the "phony" crime concocted for the Musical Mystery turns out not to be so phony!