TV Guide has some information on The Vampire Diaries Halloween episode on October 29th entitled Haunted.

Read the entire interview here.

Here is an excerpt: (Contains Spoilers)

Playing nurse in a haunted house, Elena will end up drenched in her blood and the blood of someone else. “What happens is pretty enormous,” adds coexec producer Julie Plec. “It’s our biggest thing so far. Everything that we’ve been building to with one specific character comes to a head and ultimately changes all the sibling relationships forever.”