Utilising the statistics the women give the police three names and one is arrested when evidence is found. Meanwhile Jean and Lucy have discovered seven more murders linked where they believe innocent men have been convicted. The women devise a plan to trap the hugger using Lucy as bait but it backfires when she goes with the wrong man causing trouble in the personal lives of Susan and Lucy. Another suspect emerges from a top secret war department headed by Cavendish and Susan comes face to face with the hugger at a closed mental hospital.
The Bletchley Circle follows the journey of four ordinary women with extraordinary skills that helped to end World War II.
Set in 1952, Susan, Millie, Lucy and Jean have returned to their normal lives, modestly setting aside the part they played in producing crucial intelligence, which helped the Allies to victory and shortened the war.
When Susan discovers a hidden code behind an unsolved hug she is met by skepticism from the police. She quickly realises she can only begin to crack the murders and bring the culprit to justice with her former friends.
The Bletchley Circle paints a vivid portrait of post-war Britain in this fictional tale of unsung heroes.
The Bletchley Circle - Series 1, Episode 2 Synopsis and Schedule