Just an idea thought you guys would shoot me straight

A teenage boy - might be early 20's is an insomniac, he is about to fall asleep for the first time in a long time but he is awoken by yet another fight next door. enraged he goes next door and slaughters the whole family and sets the house on fire. Returning home he falling asleep.

when he waken he's cold and naked, it turns out the government have him and he has a choice either work with them and hunt down physchopaths like him and die a hero to the world or be tried for the crime he commented.

After agreeing to do so he gets a two day crash course in weapons and combat training. However nothing is as it seems, on the last night before the mission begins the government introduce him to a girl from his past, she is missing to the world and unless he completes his mission will never be seen alive again. She must also accompany him on his mission.

This story will deal with themes such as death, rape, killing, reality, living with the choices we make in life, sanity and if there is a difference between a murderer and a killer.

It will be an action adventure story set in Europe and the UK.

I know its brief but I'd like your thoughts.