S3, E3: Klaus and Stefan arrive in Chicago, where Stefan is reunited with a vampire (recurring guest star Claire Holt – Pretty Little Liars, H20: Just Add Water), who hasn’t really moved on from her interest in him decades earlier. In a flashback to Chicago in the 1920s, Stefan comes face to face with a shocking chapter from his wild past. After Damon gets a tip on Stefan and Klaus’ whereabouts from an unexpected source, he and Elena follow their trail. Meanwhile, back in Mystic Falls, Tyler is concerned about Caroline and turns to Sheriff Forbes (recurring guest star Marguerite MacIntyre) for help.