Prophetic dreams about the mysterious fourth coffin lead Bonnie and Elena to a surprising source, while Tyler seeks help to break free from Klaus' bond so he can be with Caroline. Alaric's new friend Dr. Fell has a secret no one sees coming, and Stefan's interference in Elena's life reveals something that surprises even him.

Stefan still struggles desperately to get his blood-lust back under control. Damon keeps an eye on him, but has other priorities. Damon's former teacher Sage returns as his lover, in a secret pact against Rebekah, whom he seduces to keep an eye on her quest for the original white oak's sole known shoot. The old vampires are actually in league and torch the bridge made from its wood, fearing the weapon that could be made from it, but Damon stayed a step ahead. Dr. Fell tries to treat Alaric medically while Bonnie attempts to undo the curse which caused his hereditary madness, but they aren't careful enough, so Damon must intervene. Jeremy calls home from Denver, reporting that he only suffers from melancholy, but is doing well at school.

The 1920s Decade Dance takes a deadly turn when Damon and Stefan realize they need the help of Matt, Jeremy and Bonnie to undo a spell that could be devastating for everyone.