Guest Stars Emily Carey as Mary Conan Doyle Diana Quick as Cecelia Weiss Noah Jupe as Kingsley Conan Doyle Louise Delamere as Louisa "Touie" Conan Doyle Jerry-Jane Pears as Florrie Simone Kirby as Sister Grace Penny Downie as Mrs. Sulzbach Amanda Lawrence as Sister Mathilda Adelayo Adedayo as Sister Winnie Patrick Galligan as Beale Eileen O'Brien as Sister Fabian Flora Turner as Lucy Allthorpe
