Watch: Vidya Balan reveals her dark secret in latest promo of 'Kahaani 2'

Sujoy Ghosh is back with his suspense thriller 'Kahaani 2: Durga Rani Singh' starring Vidya Balan and Arjun Rampal. The actress, who was a part of the first installment, has returned this time with a new story and a new mystery at that. Vidya plays the role of Vidya Sinha, a mother who is trying to trace her kidnapped child.

The makers recently released the fifth dialogue promo which sees Vidya trying hard to safeguard her secret.What is this dark secret that she has kept to herself all along? Will she be able to fulfill the vow of protecting her daughter? If the promos are anything to go by, this new 'kahaani' will definitely keep you intrigued.
Watch the promo here: