Walker, our main character, works as a hostage negotiator.
He has had quite a few jobs during his career after coming home from having been deployed to South-East Asia. After coming home his first assignment was with vice, but he got fired after a complaint that he had mistreated a man during a bust. He then worked in narcotics.
Walker clearly suffers from some form of mental illness and/or PTSD. We know this because it is mentioned in the story (p. 157 ll. 23-25), that the narrator suffers from multiple mental disorders. We know that he was a sniper in Vietnam, and it is most likely an incident that has taken place during this deployment, that has caused his PTSD. Walker is likely so good at being a hostage negotiator because being manipulative comes easily to him.
Walker as a person is a very cynical man who doesn’t seem to care much for everyone else. He is also a very manipulative person.
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