Red King White Knight: Helen Mirren stars in this gripping political thriller about a plot to assassinate Soviet Union leader Mikhail Gorbachev. The CIA sends in Stoner, a former agent, to prevent the assassination. He must join forces with a former enemy and an old flame to thwart the deadly scheme. Cause Celebre: Helen Mirren stars as Alma Rattenbury, the woman at the centre of one of the most famous murder trials of the 20th century. Set in 1935, this critically acclaimed film tells the enthralling story of Rattenbury and her young lover, jointly accused of murdering her elderly husband. The true story of love, loss and murder that obsessed a nation.