Trombones turn to terror when the Doctor, Gabby and Cindy visit New Orleans at the height of the jazz age... the Nocturnes are back! This time the threat comes from their terrifying chief, intent on enslaving the human race through sound! And speaking of enslaving, it would appear that Anubis is up to his old tricks - will the Doctor and his friends be able to stop this God from damaging the whole of Time? Could there be something even more sinister behind all of this, hidden in the shadows?