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Over two decades, death followed Mary Ann Cotton from town to town. Husbands, children, stepchildren - all perishing under suspicious circumstances. As whisper of arsenic and insurance money grew louder, investigators unraveled one of Britain's earliest documented female serial killers. 

In this episode of ClueTrail, we trace the steps of Mary Ann Cotton, Britain first female serial killer -  and ask how many deaths it took before anyone stopped her. 

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