Bollywood director Anurag Kashyap promises to take his audience on a thrilling ride with his  forthcoming  `Raman Raghav 2.0` that sees Nawazuddin Siddiqui as a serial killer. The earlier three teasers of the film have been scary enough to evoke the right intrigue among the audience and the fourth teaser carries forward the fear that the earlier three had created.  The  fourth teaser shows a guy arguing with an auto rickshaw driver and inquiring him about a certain rickshaw that had `Madhuri` written behind it as he had forgotten his mobile in that rickshaw! The film is  said to  based on the infamous serial killer Raman Raghav,  but Anurag Kashyap maintains that the film is not based on the popular criminal.