When Susan Gray spots a hidden pattern in a series of murders, she tries to inform the police. But when they and her husband insist she forget her theory, Susan enlists her wartime friends to try and track down the murderer.
EPISODE 1
Cracking a Killer's Code, Pt. 1
Susan Gray spots a hidden pattern in a series of murders and enlists fellow code-breakers to try and track down the killer.
EPISODE 2
Cracking a Killer's Code, Pt. 2
Susan and the group use Lucy to lure in a suspect.
EPISODE 3
Cracking a Killer's Code, Pt. 3
Thrown into a chilling confrontation with the murderer they have tracked down, Susan and the other women become locked into a more dangerous game of cat and mouse.
Blood on Their Hands, Pt. 1
Former Bletchley Park worker Alice Merren is in prison awaiting trial for the murder of the eminent scientist John Richards; Jean attempts to regroup the circle in order to help establish the innocence of one of their own.
Blood on Their Hands, Pt. 2
Following the discovery of Lizzie Lancaster's true identity, the women race against time to establish Alice's innocence and save her from hanging.
Uncustomed Goods, Pt. 1
After Millie is released from her abductors, she -- along with Alice, Jean and Lucy -- makes a horrifying discovery.
Rachael Stirling
Sophie Rundle
Julie Graham
Anna Maxwell Martin
Mark Dexter
Anastasia Hille
Simon Williams
Michael Gould
Ed Birch
Andy De Emmony
Jamie Payne
