This is both a spin-off and a prequel to Kahaani (2012) and at the same time an origins story of the assassin Bob Biswas from that movie.
In that movie this role was played by actor Saswata Chatterjee. Where as here Abhishek Bachchan plays a slightly younger version of that character.
The story is about this middle aged guys who we are told has lost his memory in a accident and doesn't remember anything. Then he is discharged to a family in a very Overboard kind of situation, but not really.
He is then picked up by two men who may or may not be cops. They tell him that they are the ones to be thanked for his freedom from his previous life as an assassin and they need to now work for him. Are they telling the truth or are they just using him? He doesn't know. Neither do we. And that's the fun of it. Does he get his memory back? Does he get all the answers?
Abhishek Bachchan is just outstanding in this role. He gives it his all. This effort form home to reform himself has been showing constantly in his recent movies and I'm all for it.
Supporting him are other great actors who don't really get to deliver much other than Chitrangda Singh who plays his wife. She has a bit more substantial role compared to other supporting characters and does get a chance to Display her performance charm.