The Bletchley Circle is a 2012 television mystery drama miniseries, set in 1952, about four women who used to work as codebreakers at Bletchley Park. A series of murders takes place that seem to have a pattern.I love the ordinariness of the main character and her unassuming brilliance. There are three episodes available on Netflix and I am going to treat myself. Like most BBC drama, this is great acting and plotline and colorful period ambiance.
Go for it.