Can the group trust Katherine? That's the main question at the center of "The House Guest," Thursday's new episode of The Vampire Diaries.

While Elena, Stefan and Damon ponder this vital issue, the following stills make it clear that they'll also be catching up on their reading. Elsewhere on the installment, Caroline will take to the Mystic Falls Grill stage in order to impress Matt, while Alaric will open up to Jenna.

These storylines and more are teased below. Click on each image here to enlarge it and get an up-close look at a few scenes to come:

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