The Victorian poisoner is a loving wife and mother, newly returned to her native North East of England. Faced with abject poverty, an ailing husband and a young daughter, we see how ruthlessly determined she is to pursue her desires.
When her husband loses his job, Mary Ann puts arsenic in his tea, which causes him to fall sick and eventually die. As she collects the life insurance and realises what that money brings, she goes on to marry another – who also becomes victim to his mug of tea.
As she continues her cycle of collecting her husband's life insurance, her mother falls ill and dies – will it derail Mary Ann's plans?
Dark Angel, ITV, 9pm
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