After stopping by the Gilbert house to ruin Jenna and Alaric’s relationship, Isobel convinces John that she’s trying to help Elena. John is blinded by love and believes her, but Elena and Stefan are skeptical. Rightfully so, because Isobel immediately meets up with Katherine to tell her that she made a deal with Klaus to save Katherine’s life in exchange for the doppelgänger and the moonstone. Katherine is of course all in for that plan, so she goes looking for the moonstone and finds it stashed in Damon's soap. After Elena’s third kidnapping, Isobel reveals that she betrayed Katherine and that she was the doppelgänger Klaus wanted. Eventually, Elena and Isobel arrive at the cemetery where Isobel’s tombstone is and Klaus’s witch tells Isobel that her job is done and she’s free to go. Though Elena gets to go home and live her life, she and Stefan realize that Klaus is letting her live for now because he knows Elena will just go along with the sacrifice when the time comes. Not all hope is lost though: while Isobel was kidnaping Elena and betraying Katherine, Damon and Jeremy were helping Bonnie harness the power of the witches that were burned in Mystic Falls, officially making Bonnie their secret weapon to kill Klaus.This week: Season 2 Episode 17 | Know Thy Enemy Hosted on Acast. See acast.com/privacy for more information.