The Terrorist by Juggi Bhasin

When you are trained to endure the harshest of climates, the most hostile of situations, to survive where no ordinary man can there s little difference between you and the terrorist you are trying to kill. Little, except which side are you on. 

Suvir and Murad--both victims of circumstances, both numb with the pain of having lost their loved ones--choose to do things differently. While one crosses the border and becomes the most dreaded of terrorists, the other joins the Special Forces. Their face-off is a fight to death as one is out to carry out a major terrorist operation in Delhi and the other has been specially called in to foil the attack.