None of the characters had a proper build up and the plot line was so twisted that all of it in general did not make sense.
And what is up with this 'Rohini' character? Her apperance almost seemed like a guest role for the film.
The worst trait of the movie was how they assumed the gender and the apperance of the killer through the merely hair strand and how the killer who had all the time in the world to disassemble her body parts did not notice the hair in her hands.
And in my opinion, I do not think that this case would have even needed a special investigation team as what they did were normal police investigations.