World famous conductor, Elsa Von Streng, arrives at the Hibernian Orchestra, tasked with dragging the famous institution into the 21st century. For violinist Lisa Kennedy, it's a chance to learn from the best and become a soloist in her own right. But Elsa is not exactly what she seems, and her appointment brings secrets, scandals - and trouble.Teresa O'Brien is worried. Her protege Michael Clancy seems to be taking the beautiful Lisa for granted and her young friend Mai Khan isn't acting like herself. Lisa is under pressure to perform and the handsome Italian tenor, Arnoldo Messini, is a little too friendly with her for Teresa's liking.When murder strikes on a disastrous night out, Detective Malachy Flynn calls on Teresa and her O'Brien's Irregulars to save the day. Will the culprit ever Face the Music?