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