Edward, Earl of Chalcombe, walking home, is attacked. He attempts to defend himself but is bludgeoned to the ground. Death seems inevitable when a fat ugly man carrying a stick and a beautiful slender young lady appear and rescue him. The rescuers bundle Edward home and the young lady, Madelaine, summons the Bow Street runners. Refusing reward she provides no address. But Edward, fascinated by both Madelaine’s beauty and swordsmanship, intends to pursue the acquaintance. Edward seeks his rescuers and the culprits who wish to terminate his life. He offers the elusive Madelaine marriage but she repeatedly declines. Madelaine's father accepts an invitation to visit Edward's estate with her over Christmas as he takes a liking to Edward. As Edward pursues Madelaine, the attempts on his life continue. The mystery intertwines as their romance progresses and Madelaine eventually reveals the secret making her refuse to marry him.