The Bletchley Circle follows. Set in Lucy, Susan, Millie, both 1952 and Jean shortened the war and also have came back with their normal lives, modestly setting aside the part they played in producing intelligence, which helped the Allies to success. When Susan discovers a hidden code behind an unsolved murder she's met by disbelief from the police. She immediately realises she could only start to decode the murders and bring the culprit to justice. The Bletchley Circle paints a picture of post-war Britain inside this literary story of unsung heroes.