Mammootty had done the central character in the last four films of CBI series. But there is a change coming in the 5th film in that series. Suersh Gopi is doing the central character in the coming movie. The script of this film is little bit complex. Script writer S.N. Swamy told that Mammootty has already read the script . Mammootty suggested to try another act with this role. The discussions are going on with casting the actors for this movie.