Hit man - Lawrence Block

The hit man of the title, Keller, tells his story episodically job by job. His tasks come as and when and with little warning. The call comes, he visits his paymaster to collect instructions, he travels to the hit's home city, does the job, returns. Often he likes the town he visits - enough even to look into real estate prices, but he always returns to New York City, to the chance of another job.

Nothing changes until he begins visiting a therapist - a man who after a number of visits works out what our hero does for a living. He proposes a hit - he wants a woman killed. But in doing his job, Keller realises that he has been used and returns to take revenge on the therapist.

The upshot is that in killing his therapist Keller orphans a dog. The dog needs a home, Keller provides one, prompting the next major change in his life. When he goes away Keller needs a dog walker...finding a suitable candidate is easy enough, but before long she's resident in his flat and a whole new set of life rules are looking Keller in the face. Can he keep his job - can he keep his dog and his lover once they know what he does for a living?