The two-part, true-life mini-series Mrs. Wilson (airing on Masterpiece on PBS) tells the story of Alison McKelvie (Ruth Wilson) who fell in love with Major Alexander Wilson (Iain Glen) after meeting him while working a secretarial job with the Secret Intelligence Service. During the years of their marriage, Alison believed that her husband was a popular author of spy novels who was also doing real intelligence work for the war effort, only to find out that he actually had other wives and other families, making her wonder whether she ever really knew him, at all.   During this …