Best-selling author Agatha Christie was born Agatha Mary Clarissa Miller on September 15, 1890, in Torquay, Devon, in the southwest part of England. The youngest of three siblings, she was educated at home by her mother, who encouraged her daughter to write. Agatha Christie published her first novel, The Mysterious Affair at Styles, in 1920, and went on to become one of the most famous writers in history, with mysteries like Murder at the Vicarage, Partners in Crime and Sad Cypress