This book is part of a four book series about evil fairies who live inside Grim Hill. Cat just wants to live a normal life but thats impossible in this town. The soccer team isn't doing well so they have to learn ballroom dancing. Cat plans a Valentines dance and wants to get this really cool dress but it costs $107. Cat puts up signs saying she is willing to do some comunity service to earn some money to buy the dress. The first people who called were Alice and Lucinda. They asked her to help load up some boxes from their garage. Cat found a valentine that Lucinda had kept for 70 years. Can Cat piece together the mystery behind the 'sweetheart fairy' and the evil banshee?