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