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. … Joanne Froggatt, Mark Underwood, Alun Armstrong, Jonas Armstrong, John Bowler, Sam Hoare, John Hollingworth Added on Amazon Prime 2021-11-13. Youtube Trailer