What should have been the simple robbery of a stagecoach for outlaw Brent Clancy turns into a deadly game of wits with a band of assassins determined to kill the President of the United States. In the course of this adventure, the one-time road agent finds himself on the right side of the law for a novelty, fighting both to save the President's life while at the same time avenging a personal grievance.

When Irishman Richard O'Shea, commonly known to everybody as Rick O'Shea, decides that the time has come to give up his life of banditry and return to his own country, he feels the need first to make his confession in San Angelo's Catholic church. His plans are thrown into disarray when, at the priest's urging, he delays his voyage home, in order to undertake the rescue of a child being held to ransom across the border in Mexico. Caught between a vicious band of cutthroats on the one side ...