David Mamet wrote this screenplay under the name Richard Weisz, as a gun for hire, much like the masterless samurai of the film's title, who roamed Japan in the 19th Century, loyal only to themselves. A group of men with highly developed skills are called to a meeting in a deserted warehouse in Paris. Sam (Robert De Niro), an American, may be ex-CIA. Vincent (Jean Reno), the terminally cool Frenchman, is a mystery. Russian computer whiz Gregor (Stellan Skarsgaard) is presumably ex-KGB, and Spence (Sean Bean), a British demolitions man, and Larry (Skipp Suddith), another Yank, round out the team. They've been hired by the IRA, through liaison Deirdre (Natascha McElhone), to steal a briefcase of unknown contents somewhere in Europe. As the unit races from one spectacular location on the French Riviera to another, the body count mounts, some Russian gangsters get into the act, and the betrayals come fast and furious. In a rare comic moment, Sam stitches up his own bullet wound, and asks a friend to finish b...