Season 3 begins with Klaus becoming suspicious when an old vampire friend arrives in New Orleans with a mysterious agenda involving the Mikaelson's remaining sire lines. Meanwhile, Hayley struggles with being cursed to her wolf form in the bayou. In the French Quarter, a series of gruesome discoveries are made that may be the work of a serial killer; and Marcel, who has regained control of the French Quarter, tries a new strategy to recruit vampires.