Master Keaton is a Japanese manga series created by Hokusei Katsushika, Naoki Urasawa, and Takashi Nagasaki. It was serialized in Big Comic Original from 1988 to 1994. In North America, Viz Media licensed the manga for English release.
The story revolves around Taichi Hiraga-Keaton -- Oxford-graduate in archeology, former SAS commando, current insurance investigator for Lloyd's of London -- as he travels around the world using his unorthodox means of investigation to solve capers, battle terrorists, and try to uncover ancient civilizations.
Think of it as a cross between Jack Ryan and Indiana Jones.