The Vampire Diaries (2009)

S3E14 Dangerous Liaisons

Elena is taken aback when she gets an invite to a formal ball, and both Damon and Stefan are eager to accompany her after learning it's being held at Klaus's newly refurbished mansion. Meanwhile, Caroline and Matt are surprised to receive invitations from unexpected suitors. At the sophisticated gathering, Elena uncovers a chilling scheme that threatens many lives, forcing her to choose whom to confide in. Caroline encounters an unexpected side of Klaus that surprises her. By the end of a night filled with turmoil and shattered dreams, Damon discovers a new method to deal with his emotions.