Plot summary
Klaus, at Katherine's suggestion, returns to his former home of New Orleans to find a witch with ties to him. He instead finds a former protégé, Marcel, ruling the city with an iron fist. As Klaus continues his search, he finds that the witches who live there are trying to overthrow Marcel and that they plan to use Hayley, who is carrying Klaus' child, in their plans. After Elijah arrives to help and persuades him to stay, Klaus decides return the city to his command with his brother by his side. Rebekah is offered a spot in Klaus' new domain, but she turns them down. In Mystic Falls, Damon and Stefan begin extreme measures to return Elena's humanity by imprisoning her in the basement of the Salvatore house.
Credits
Adapted from Wikipedia contributors, The Vampire Diaries season 4. HTML formatting and reference markers removed.