Plot summary
Back in Mystic Falls, Caroline and Tyler find that their attempt to translate the code on the Hunter's Sword is futile without help from Klaus, who has his own reasons for solving the puzzle. On the island, Damon has an ugly run-in with a Hunter named Vaughn (guest star Charlie Bewley ), and realizes he is one of The Five. Stefan confesses his true feelings about the possibility of becoming human again to Elena. When a stunning new piece of information about the cure is suddenly revealed (there's only enough for one person), it changes the stakes for everyone.
Jeremy helps Bonnie recognize what is real and what is an illusion, and Shane is comforted by his deceased wife. Katherine makes an appearance and forces Jeremy to feed Silas in order get the cure that is fossilized with his body. Silas ends up draining Jeremy's body and breaks his neck, killing him.
Credits
Adapted from Wikipedia contributors, The Vampire Diaries season 4. HTML formatting and reference markers removed.