<P> Samuel (Shaam) is a police officer investigating serial child abuse and murder crimes . He receives a phone call from a child abuser, who calls himself "Joker". Samuel tracks his location, goes to his place and is killed by the Joker . The cases are picked up by Officer Andrews Eappan (Arya), from CBCID . The story then shifts to Sarah David Anikha, a 10 - year - old girl whose hero is her father David Nainan (Mammootty), a well known builder . They share a strong bond, David does anything to make his daughter happy . </P> <P> One day when he returns to his flat from his office, he finds Sarah lying unconscious in the lift . He finds out that she was brutally raped . He is shattered and takes her to the hospital where his wife, Dr. Michelle (Sneha), works . </P> <P> After a few days, Sarah gradually recovers and reveals that it was a joker who raped her . David and Michelle, enraged at the Joker, decide to find and kill him, as he is doing the same thing to other girls the same age as their daughter . </P> <P> David starts an investigation parallel to the police, which causes Andrews to become suspicious . Andrews later finds out that David's daughter is one of the Joker's victims . He questions Sarah at their flat while David is away . David warns Andrews for doing that as it is emotionally painful for Sarah . David and Andrew start receiving calls from the Joker . Both of them who are parallel but reaches the Joker's place . The Joker beats up Andrews and David, but David manages to overpower him and kills him on top of a hill . </P>

Who plays the father in the movie the circle