Starring Downton Abbey's Joanne Froggatt, Dark Angel tells the story of Mary Ann Cotton: loving wife, mother, and serial murderer. See it Sunday, May 21, 2017 at 9/8c on MASTERPIECE on PBS. #DarkAngelPBS
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Joanne Froggatt, who stole the hearts of millions of viewers as Anna, the loving and resilient lady’s maid on Downton Abbey, stars in a totally different role in this spine-tingling drama. Dispensing death from the spout of a warm teapot, Froggatt plays the notorious Victorian poisoner Mary Ann Cotton, Britain’s first female serial killer.