HIDE IN PLAIN SIGHT - Elena and Alaric both lash out at John when Isobel's (guest star Mia Kirshner) unexpected arrival leaves Jenna devastated. Bonnie works with Damon and Jeremy to find the spell they'll need to harness her ancestors' power. A heartbroken Caroline doesn't know what to do about Matt. Stefan and Damon realize they have a new secret weapon. Wendey Stanzler directed the episode written by Mike Daniels.