<P> Isobel returns to the house she stays in and Katherine is there waiting for her . The two of them seem very close and Isobel informs Katherine that she managed to find a witch who is in the trusted circle of Klaus and she made a deal to save Katherine's life if they deliver the moonstone and the doppelganger to him . That makes Katherine turn against the Salvatores once again and she finds and steals the moonstone . </P> <P> Isobel creates a distraction at the Lockwood house to give Katherine the time to take Elena's place . Isobel leaves with Elena and Stefan leaves with Katherine believing that is Elena but he recognizes her and asks where Elena is . Katherine injects him with vervain and she goes back to Isobel's house . She calls Isobel but Isobel apologizes to her telling her that Klaus wanted Katherine and she could not do anything about it . She hangs up the phone and Maddox (Gino Anthony Pesi), Klaus' witch, who was waiting in the house, knocks down Katherine . </P> <P> Jeremy finds out that if Bonnie uses the power she channeled from the dead witches to kill Klaus, then she will die too . The two of them fight but Bonnie tells him that it is her decision to make and that he cannot tell Elena about it . Caroline tells Matt everything but Matt asks her to make him forget since it is too much for him . Caroline compels him but it is revealed a little bit later that Liz asked Matt to take vervain so he can remember what Caroline would tell him without her knowing that she could not compel him . Matt meets Liz and tells her everything . </P> <P> Isobel takes Elena to her grave and while they are talking, Isobel gets a phone call from Maddox who tells her that he has the moonstone and Katherine . Klaus has everything he needs at the moment and Isobel can let Elena go . Isobel apologizes to Elena for what she has done to her, she removes her necklace that protects her from the sun and she gets burned in front of Elena . </P>

Vampire diaries season 2 episode 17 full episode