An urgent phone call from a principal/friend sends retired music teacher Susan Wiles rushing through the doors of Westbrook Middle School, where she discovers a ransacked office and a missing bookkeeper. Eager to keep the break-in quiet, Principal Antonio Petrocelli enlists her help. Susan had already proven her sleuthing expertise by solving murder cases at Westbrook Elementary and Westbrook High. Too bad Susan's detective daughter Lynette doesn't appreciate her mother's interference in police business. That won't stop Susan, however. What clues does she have this time? A missing bookkeeper, two brothers, a waterfall, and a suspicious death. What's the relationship? It's all very murky and Susan must solve the mystery while in the middle of coping with an acute family crisis that may forever change the life of someone she loves.