The good: The movie, as the credits indicate, is derived at least partly from the Korean movie "Montage". The story is quite suspenseful and the director does a good job juggling between various interweaving stories and time periods. Performances from the lead actors are solid and little to fault there. The negatives: My main gripe with the movie is that it contains several idle moments which do not seem to serve much purpose to either the development of the plot or characters or the overall experience. Overall verdict: Otherwise, the script is solid and the movie is well worth a watch. It also continues the gradually building list of quality Hindi whodunits with West Bengal (more specifically Kolkata) as the backdrop after Kahaani and Byomkesh Bakshi. I would also recommend Baishe Srabon, an excellent thriller in Bengali language, for whodunit fans