Henry Bride is an agent with Homeland Security.
He has been one for quite a few years, more than a decade, and he is good at it. He is a sniper, trained as one in the Navy where years before he had held the rank of Lieutenant. "His employers ... trust him with certain 'special' missions - missions that on occasion had him bluntly taking the lives of certain enemies of the country."
He is also, when he is not looking down the barrel of his rifle, an investigator and a hunter of people and one of those called in when there is evidence someone is out there ready to do harm and someone has to track him down and stop him. Bride is that someone.