Klaus, the original vampire/werewolf hybrid, returns to New Orleans -- which his family helped build -- to investigate rumors of a plot against him, in this spinoff of "The Vampire Diaries." He finds his former protege, Marcel, reigning powerful over its inhabitants, causing growing tension in the supernatural community. Klaus' brother, Elijah, joins him, and they learn that werewolf Hayley has fallen into the hands of a defiant witch who has life-changing information. In hope of reclaiming the city, Klaus and Elijah form an uneasy alliance with the witches to help further their cause.