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You can stream Dark Angel (2016) on Amazon Prime with a subscription.

The story of Victorian serial killer Mary Ann Cotton, a poisoner whose methods leave no visible scars, allowing her tally of victims to mount, unsuspected by a Victorian society unable to conceive of a woman capable of such terrible crimes. Traveling around the North East, she insinuates herself into unsuspecting families, marrying and creating new families of her own - before killing them, taking their money and moving on.

Victorian North East fog rolls through a society too blinded by gendered assumptions to notice a predator in their midst. This chilling portrait of Mary Ann Cotton tracks a killer who uses arsenic to vanish lives without leaving a single mark.

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