Dublin Murder Squad Detective Frank Mackey (Faithful Place) and his daughter Holly are back. Years have passed and now Holly is all grown up and in high school at St. Kilda’s, a private all girls’ school in a quiet, leafy suburb of Dublin. Holly and her best friends Julia, Becca and Selena are living together in the dorms and thrilled to be at boarding school away from the boring chores and rules of home. But the peace is shattered when a violent crime takes place on the grounds of the school the handsome and popular Chris Harper is found murdered on campus and the police are stumped.