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3 episodes
1. Cracking a Killer's Code: Part 1
Seven years after WWII, four former female Bletchley Park codebreakers return to their crime-solving past. Susan, Millie, Lucy, and Jean team up once again to find the killer.
2. Cracking a Killer's Code: Part 2
Susan investigates the victims' whereabouts to narrow down a list of suspects. Elsewhere, Jean and Lucy suspect that the wrong men have been convicted for a series of murders.
3. Cracking a Killer's Code: Part 3
Susan finds a coded message in her home with Cavendish's address that unveils more clues that may ultimately lead her into the killer arms.
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