Guest Stars Emily Carey as Mary Conan Doyle Noah Jupe as Kingsley Conan Doyle Louise Delamere as Louisa "Touie" Conan Doyle Ewen Bremner as Sherlock Holmes Angela Curran as Vera Tufts Joe Sims as Nathaniel Risteard Cooper as Charles Doyle James Fleet as Dr. Pilsen Charlotte Hope as Molly Morgan Kevin Trainor as Priest Michael Shelford as Simon Fleming Lewis McGowan as Young Doyle Andrew Bicknell as Exorcist Chu Omambala as Dr. Randall Chook Sibtain as Dr. Chandra Stacy J. Gough as Guard
