Superficially, John Keller leads a normal life, despite his profession as an assassin. He has an office manager, the breezily efficient Dot, who organises his 'jobs' and who reassures his grumbling conscience. He is an obsessive stamp collector. In a blackly comic twist, he even gets called for jury service. Laid back, couldn't care less, morally distanced from his vocation, Keller is an intriguing character. And then Keller's jobs start to go wrong. Targets die before he can get to them. Gradually he realises that he is being stalked. Another hitman is trying to weed out the competition and kill him. Keller and Dot try to turn the tables but how many innocents will get caught in the crossfire before Keller is truly safe?