Kahaani is a story is of one pregnant woman Vidya Bagchi (Vidya Balan), who arrives in Kolkata from London to search her missing husband. Cops were not able to do anything as no record exist about her husband. After some investigation, with the cop Parambrata Chattopadhyay as Rana, Vidya finds that her husband had a lookalike with a intelligence department official turning into a terrorist. She starts finding him to get closer to her search.
After that, Vidya's search for her husband turns into a bureaucratic twist, due to involvement of the intelligence department. The story starts simple, but remains a suspense throughout. It always keep audience guessing what's goin to happen next. But the story requires your absolute attention. If you loose a single moment in the movie, you will not able to understand the movie at all. The climax will leave you spellbound. However, it can leaves you confused also.
Vidya Balan after winning National Award for Dirty Picture, once again proved that she has the ability to act in thriller roles also. Her acting is one of the best so far in the movie. Parambrata Chattopadhyay as cop Rana, also palys a good role and comes out as a revelation. Nawazuddin Siddiqui, as Khan, official of the intelligence department., also acts exceptionally well. Final Rating: 3.5 stars out of 5.