Actor Carey Mulligan discusses her newest film, "Promising Young Woman," in which she plays Cassie, who is determined to find revenge for a friend after an assault that took place many years ago. For Mulligan, the script was unpredictable and exciting. "This character is just stuck in a way and also somebody who's extremely loyal," she said on "Salon Talks." "It was important for me not to approach it as a revenge thing, I think this is someone who just absolutely loved her friend and is loyal to her to her own detriment. I thought she was fascinating."

"Promising Young Woman," directed by Emerald Fennell, opens Christmas Day in theaters.