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 James Fleet as Dr. Pilsen Charlotte Hope as Molly Morgan Joe Sims as Nathaniel Michael Shelford as Simon Fleming Kevin Trainor as Priest Lewis McGowan as Young Doyle Risteard Cooper as Charles Doyle Andrew Bicknell as Exorcist Chook Sibtain as Dr. Chandra Chu Omambala as Dr. Randall Stacy J. Gough as Guard
