The Moving Blade by Michael Pronko

When the top American diplomat in Tokyo, Bernard Mattson, is killed, he leaves more than a lifetime of successful Japan-American negotiations. He leaves a missing manuscript, boxes of research, a lost keynote speech and a tangled web of relations.

After his alluring daughter, Jamie, returns from America wanting answers, finding only threats, Detective Hiroshi Shimizu is dragged from the safe confines of his office into the street-level realities of Pacific Rim politics.

With help from ex-sumo wrestler Sakaguchi, Hiroshi searches for the killer from Tokyo’s back alley bars to government offices, through anti-nuke protests to the gates of an American naval base. When two more bodies turn up, Hiroshi must choose between desire and duty, violence or procedure, before the killer silences his next victim—and the past.