Keller is a normal guy, likes to do the crossword puzzle, watch television and lead a pretty normal lifestyle. Until his phone rings, and a woman known as Dot sends him off to various locations to kill certain people. The speed and method depend on how fast the client wants the job done. Keller isn't a sadist, he doesn't get any particular enjoyment out of ending these people's lives, but he doesn't have many other skills that can earn him such a lucrative living. He also faces several conundrums. What if the client is the person that turns out to be his target? What if his boss (Dot) is growing increasingly senile and accidentally accepts contracts from two different targets, on each other? Who does he terminate first? Keller also has to face the fact that his personal life isn't terribly interesting. He goes to see a therapist to sort out his issues, but that doesn't end well. He gets a dog, and also meets a woman and starts dating her. He starts collecting stamps. Will he find a middle ground?