Rain Fall(2003)

Barry Eisler

John Rain kills people. For a living. His specialty: making it seem like death by natural causes. But he won't kill just anyone. The target must be a principal player. And never a woman. Half American, half Japanese—but out of place in both worlds—Rain is filled with opportunities. John Rain may not be a good man, but he's good at what he does...

Until he falls for the beautiful daughter of his last kill.