Guest Stars Emily Carey as Mary Conan Doyle Noah Jupe as Kingsley Conan Doyle Blake Harrison as Lyman Biggs Sebastian Croft as Newsie Mary Healey as Mrs. Blake Dritan Kastrati as Vladimir Patlinov Craig Conway as Angus Tuttle James Lance as Barrett Underhill Tereza Srbova as Natalia Kroshenko Tommy McDonnell as Nigel Pennington Dean Forster as Herbert Ogilvie Natasha Sparkes as Sophie Helen Millar as Isobel Underhill Scott Jenkinson as Spring Heel'd Jack Paddy C. Courtney as Gaines
