The story is set during the
Georgian era in the 1750s, and follows Lord Jack Carstares, the eldest son of the Earl of Wyncham. Six years ago, Jack took the blame when his younger brother Richard cheated at cards. Jack consequently faced social exile and fled England for the European continent. He has now secretly returned, robbing carriages as a highwayman. In public he calls himself Sir Anthony Ferndale. Jack discovers his father has died but refuses to take up his role as the new earl of Wyncham, preferring that his brother enjoy the family's privileges in his place. The amiable Richard, who still feels guilty over his role in his brother's social ruin, refuses. This decision displeases Richard's spoiled wife, Lavinia. A disguised Jack attempts to rob a carriage, but fails when his prey notices Jack's pistol is not loaded. The supposed victim, Miles O’Hara, a
Justice of the Peace, arrests Jack. Recognizing Jack is a gentleman, Miles takes him back to his residence to interview him. Miles is delighted to discover the outlaw is actually his old friend, estranged since the gambling incident years earlier. Lavinia's brother, the Duke of Andover—called the "Devil" among society—is sarcastic, darkly humoured and manipulative. He desires Miss Diana Beauleigh, a young woman he met in Bath, and is almost successful in abducting her when a disguised Jack encounters them. The two duel, and Jack triumphs over Andover and frees Diana. Jack is injured and recovers at Diana's home. He does not reveal his identity, instead referring to himself as Mr. Carr. The two fall in love but Jack cannot allow himself to be with her, as he sees himself as a scoundrel and unworthy of her love. He returns to the O'Hara residence. Richard becomes upset when Lavinia spends too much time with one of her old suitors, Captain Harold Lovelace. Richard can keep silent no longer and plans to reveal his cheating to a large party, to the dismay of Lavinia. Richard gives her permission to leave him and elope with Lovelace, but she realises she truly loves her husband and sees the error in her spoiled ways. The two reconcile and embrace happily. The Duke of Andover succeeds in kidnapping Diana, desiring to marry her. He brings her back to Andover Court, his estate. Jack learns of the abduction and arrives in time to duel Andover. Richard, Miles, and Andover's brother Lord Andrew arrive and stop the fight right as Jack collapses from fatigue. Richard confesses his role in the cheating scandal, clearing his brother's name. Jack and Diana embrace and get married. They avoid a scandal with Andover, as the latter persuades them that any news of the abduction will hurt Diana's reputation. ==Main characters==