"Lady Audley's Secret" by M. E. Braddon is a sensation novel published in 1862. The story follows the beautiful and enigmatic Lucy Graham, who marries wealthy Sir Michael Audley despite her mysterious past. When Robert Audley's friend George Talboys vanishes after visiting the estate, Robert begins investigating—and troubling evidence points toward the charming Lady Audley herself. This tale of secrets, possible bigamy, and dark deeds became the most successful sensation novel of its era.