Sam Farragut is a sociopathic business executive in Southern California who forces a team of advertising agency employees to embark on a dangerous dirtbike trip to the Baja California desert in order to compete for his business .  The men are Warren Summerfield , a suicidal middle-aged ad executive who has been fired from the agency ; the straightlaced Paul McIlvain who is inattentive to his wife , and brash art designer Maxon who feels suddenly trapped after his girlfriend announces she is pregnant .  There are numerous long sequences of motorcycle riding on desert backroads .  Summerfield has been having an affair with McIlvian's wife .  He has not told his wife that he was fired and is simply serving out his tenure at the agency while looking for a new position .  His wife is actually aware of the affair .  Farragut convinces the ad men to make the motorcycle journey on the pretext of looking for a location to shoot a commercial .  In reality , Farragut is reckless and looking to involve the men in spontaneous edgy adventure of his own manipulation .  After they leave , McIlvain's wife suspects that Summerfield is planning to kill himself for the insurance money , but she can not convince Summerfield's wife to instigate a search .  The four men travel deeper into Mexico on isolated dirt roads .  At one point Summerfield contemplates plunging off a cliff .  After being humiliated by a young American couple in a Baja bar , Farragut tracks them down on the beach while accompanied by Maxon . 
Whose wife knows about the affair between Summerfield and Paul McIlvain's wife?
Maxons wife