The door to terrace has been locked from inside.The police broken the lock and then open the door and went to terrace and found the body..If the trio taken hemraj to terrace and killed and then they gone. 1).who locked the door to terrace. 2).There was blood staines and the finger prints on the terrace door.
This are the points where CBI is unwilling to give clean chit toi Talwars...
