Season guide

The Bletchley Circle: Season 1

3 episodes Premiered Sep 6, 2012 Updated Oct 4, 2026

Season 1 Episodes

Episode Guide

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Season 1: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

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33%

Mytharc (2): Crucial lore & season climaxes

Core (1): Character development & subplots

Side Quest (0): Standalone / filler

S1·E1 Mytharc

Cracking a Killer's Code (1)

Sep 6, 2012 · 45 min

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

S1·E2 Core

Cracking a Killer's Code (2)

Sep 13, 2012 · 45 min

As Susan and the other Bletchley women close in on the murderer of the five girls, a shocking discovery calls their theories into question and forces them to set a dangerous trap -

S1·E3 Mytharc

Cracking a Killer's Code (3)

Sep 20, 2012 · 45 min

Thrown into a chilling confrontation with the murderer they have so brilliantly tracked down, Susan and the other Bletchley women become locked into a ever more dangerous game of c