When professional typist Letitia Glover is desperate to learn more about the fate of her twin sister Flossie, Enola enlists the help of her brother Sherlock and her friend Tewky to investigate Flossie's husband, the sudden death of his first wife, and the mysterious appearance of a black barouche.

When Mordred learns the identity of his father, he struggles with feelings of hatred, but also fights the fate which determines that he kill the good and gracious king.