This movie is touted as a thriller, and the trailer wholly does a job a thriller should: giving you gooseflesh.

And while we have still not gotten over the mind-boggling performance Vidya Balan gave in The Dirty Picture, looks like she is all set to bowl us over again with Kahaani!  After watching the trailer, you feel there is a sudden transition in Vidya from a sexy avatar in The Dirty Picture to a pregnant woman in Kahaani; perhaps that is what versatility is all about!