Welcome to Aberfal Boys High School. Independent jewel of academic and sporting excellence in the South-west - until the headmaster is murdered in his study. And now the Year Seven School Mums' WhatsApp Group really do have something to talk about. . . As the resulting police investigation reveals more and more of Aberfal's long-hidden secrets the list of suspects who wanted the headmaster dead grows by the day. And far from being a glittering jewel of exclusivity and excellence it would appear Aberfal Boys High School is rotten to its core. . .