Lady Boynton

Lady Emily Boynton (aka Mrs. Boynton) is the secondary antagonist of Agatha Christie's Appointment With Death, as well as the book's primary victim. She is also the posthumous main antagonist in the novel's stage play adaptation and its 2008 television film adaptation in Agatha Christie's Poirot. She is the sadistic and condescending matron of Boynton family, as well as the abusive mother of four children. In Agatha Christie's Poirot, she was renamed as Leonora Boynton.

Trivia

 * The famous threat made by Lady Boynton was ommitted in Agatha Christie's Poirot, due to the adaptational change of Lady Westholme's murder motive in the series adaptation, and thus the line became irrevalant.
 * In the Agatha Christie's Poirot, Lady Boynton was not a retired warden. Instead. she was in control of a large financial empire. She could not have any children of her own, so she selected her children from orphanages, all of whom were badly abused and tormented.
 * In the stage play adaptation, the reason behind Lady Boynton's death changed drastically. Rather than being murdered by Lady Westholme, Lady Boynton commits suicide in order to instill fear and paranoia over her children, intending to make her iron grip on their lives last even in death.