Rod Gavin is an agent for the CIA.
Growing up in New York City, Gavin's early years were normal and with little to note. When he was old enough, he joined the military and, as happened to most during the late 60's, he found himself transferred to Vietnam. It was while serving there that two things of import happened. The first was that he was noticed by the Agency as someone who could get the job done and someone who knew how to kill when needed. The other was an altercation, the nature of which was not mentioned but the severity of which was enough to get him a court martial and likely sent for a while to prison.
That was when the CIA made an offer that Gavin might have refused but decided not to. The CIA was putting together a team of operative known as the Terminators, one of several 'free-lance' contract killers. These agents, trained in the deadliest forms of combat, were kept off the books to prevent scrutiny. Each was given a legitimate job in Washington as a cover to pay the bills and keep them busy until an assignment came. Gavin was put under contract to handle eight missions. When Gavin. at one point in his work for the clandestine organization, indicated he wanted out, he was told that if he reneged on the contract, he would be returned to the military to serve time at Leavenworth.
At first, Gavin worked at the Department of Agriculture but that did not last long as he hated the idea of sitting at a desk doing a job just to occupy his time. That was when he told his Agency contact that he was heading west. The control had no problem with that as long as he could reach Gavin whenever a job came up and as long as Gavin answered.
Gavin headed to Colorado where he lives a solitary life reading, enjoying the mountain life, and pondering what would be next for this 33-year old man. While he was not certain, he entertained hopes that it might include Kendall, the lovely owner of a book store in High Card, Colorado.
The contract Gavin had with the CIA was for eight missions. When the series starts, oddly enough, Gavin is being given his eighth, and last, assignment. The remaining four adventures chronicled are missions beyond his requirement and agreed to only because the situation seemed to warrant it.