Elena (Nina Dobrev), Caroline (Candice Accola), Bonnie (Kat Graham), Tyler (Michael Trevino) and Matt (Zach Roerig) along with other senior students are at the school when Klaus (Joseph Morgan) arrives and gets Elena.
She explains that her old friend, Pearl (Kelly Hu), knew a vampire hunter who knows how to kill Klaus.
Damon reminds her that both of them are dead; she explains that Jeremy is the key to contact them since he can see and talk to Anna’s ghost.
As a reaction to the news, Klaus gives Bonnie twenty minutes to find the solution, or Stefan will feed on Elena.
He jumps in the swimming pool and drowns; when Bonnie finds him, she starts CPR while Matt sees and talks to Vicki.
When he comes back, he tells Bonnie that the doppelganger has to die in order for the transition to complete successfully.
Damon sees a text from Bonnie about Klaus being in Mystic Falls and he goes back, leaving Jeremy with Katherine to find Mikael.
[...] One great thing about The Vampire Diaries is its willingness to let characters truly evolve and transform, while still managing to maintain the core characteristics that defined them in the first place.
The episode felt a bit disjointed at times, but it was so quick moving on so many levels that it is hard to complain about that too much.
"Counting the interesting and important things that happen in this episode would be a long job, but when wondering what's been resolved or tied up you might realise how much more could lie ahead.