EXCLUSIVE: Stalin's Russia is set to be portrayed on the small screen after Episodes and Flack producer Hat Trick Productions optioned Simon Sebag Montefiore's novel One Night in Winter. The book tells the story of marriage, childhood, danger, and betrayal in Stalin’s Moscow during the bleak days after World War II. The move is a major drama statement for Jimmy Mulville's Hat Trick, which is best known for producing comedies, including Channel 4's hit teen series Derry Gir…