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Another chance to catch the first series of this cracking crime drama. If you’re partial to a cryptic crossword, you’ll grasp what drives Susan (Anna Maxwell Martin), wartime codebreaker-turned-1950s housewife. After news reports of a serial killer, Susan realises the ‘pattern’ of murders doesn’t make sense and that there may be another body. The police follow up her hunch, but when they find nothing, her husband forbids her from taking it further. So Susan secretly recruits three of her former colleagues to set about finding the killer…