Love, dances and murder

When Lizzie goes to the first school dance of the year, she expects nothing more then a good time. She has a good time and goes home. But when she goes back to school the next day, her school is a murder scene. Equally worse, nobody knows who the killer is, and he or she is probably walking the school halls with them! The police have no leads. Lizzie has to catch the killer, not only for a story in the school newspaper, but for the safety of all of the students.