<P> The Bletchley Circle is a television mystery drama miniseries, set in 1952--53, about four women who used to work as codebreakers at Bletchley Park . Dissatisfied with the officials' failure to investigate complex crimes, the women join to investigate for themselves . </P> <P> The first series of the miniseries, produced for ITV, was originally shown in the UK in 2012 and premiered in the U.S. in April 2013, on PBS . A second series was broadcast on ITV in January 2014 and on PBS in April 2014 . Both series were later aired by Australia's ABC TV . </P> <P> The programme was not renewed for a third series . In 2018 a spinoff series titled The Bletchley Circle: San Francisco was announced by BritBox . </P> <P> Susan Gray, Millie, Lucy, and Jean work together at Bletchley Park to decipher German military codes for the British military, during World War II . After a brief introduction of the four women at Bletchley during the war, the series begins in 1952, seven years after the war's end, when Susan, Millie, Lucy, and Jean have returned to their ordinary lives . As the story begins, Susan learns about a series of murders that has occurred in the London area and begins to recognize patterns connecting the killings . This inspires her to return to her codebreaking past, and she reaches out first to Millie, and then to Lucy and Jean, after unsuccessfully trying to convince the police to follow up her theory about the crimes . </P>

How many episodes in bletchley circle season 3
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