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 American, 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 Tec-9 reigns, 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, an act of tongue-in-cheek Hemingwayism, and asks a friend to finish before he passes out. RONIN features an exceptional cast, sumptuous locations, and the kind of realistic, high-coefficient-of-adversity car chases and action scenes that one expects from a director of John Frankenheimer's skills.