Official Synopsis of "She's come undone" (#4.21)

LET'S MAKE A DEAL - Stefan (Paul Wesley) and Damon (Ian Somerhalder) try a new brutal approach to cause that Elena (Nina Dobrev) turns on her humanity, and Caroline (Candice Accola) is frustrated when her attempt to intervene is counterproductive. When Elena finds a way to put in evidence the Salvatore brothers, they ask for support from an unexpected source. Matt (Zach Roerig) gives some unsolicited advice to Rebekah (Claire Holt) about their life choices and change tries to help her. Caroline has a confusing and dangerous encounter with Klaus (Joseph Morgan) and Katherine (Nina Dobrev) suspected when Bonnie (Kat Graham) makes you an offer, which promises to benefit both. Darnell Martin directed the episode written by Michael Narducci and Rebecca Sonnenchine.