I think for Virani's family thier past history repeat itself.
this time it is like Gujral murder, where first mihir and then karan are suspected for the murder and the rumours were that Harsh was going to kill Gujral but at the end surprise come as the killer was not one excepted to be Nandni.
I think again there will be similar story to like this, first someone will be suspected then someone else.
may be Saahil or Karan first then nakul or mihir and the end someone we never thought will kill,
mayber lakshya...Eklavya...or who