In The Mysterious Affair at Styles[edit | edit source]
Mary added a sedative to Emily’s coffee. When Emily died, she thought she was the murderer but later realized Emily was poisoned with strychnine.
In Curtain[edit | edit source]
Portrayals[edit | edit source]
In Agatha Christie's Poirot, Mary Cavendish was portrayed by Beatie Edney.
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