It was a good thriller at the start but in the end the director seems to have got confused that how he should end and made the mockery of it. Will never watch it's second season if it is made. Except Arshad Warsi, rest of the actors acted horribly. The limited oxygen chamber story at the end looked very disgusting. The psychopath killer was so intelligent that he managed to fool those CBI officers who could judge the coordinates of location by merely listening a telephonic conversation. The story started very strongly but after 50% (coffin incident) the story, direction, acting and logic deteriorated completely.
If you want to watch anything on TV, keep this as your last option.