A Clean Kill in Tokyo - Barry Eisler

A Clean Kill in Tokyo is the first novel in the John Rain series. Kindleunlimited.

John Rain is an assassin. Rain specializes in making it look like natural causes. He's very good at his job. When Rain finds himself being pulled in by the consequences of his last job, things get complicated fast. The woman kind of complicated. Getting himself and the woman out of this alive is even more complicated. Very highly recommended.