Cañon de los Embudos, Mexico - It's 1886 and General George Crook is holding a peace conference with the last wild band of Apache renegades and their chief, Geronimo. The Apaches are expected to lay down their arms and go peacefully to Arizona - until Geronimo disappears into the night with a small band of warriors.

A treaty with Mexico allows the U.S. Army to track the hostiles into Mexican territory. General Nelson A. Miles replaces General Crook and oversees the final effort to come to terms with the renegades. Russell Norwood, a courier, and chief of scouts Tom Horn are assigned to accompany Captain Henry W. Lawton's pursuit of Geronimo into northern Mexico. Intrigue thickens with Horn's intention to kill Norwood during the course of the mission. Stopping in a Mexican village, Norwood meets Elena, a most unusual and beautiful woman who will come to play a key role in protecting the Indians once they have agreed to surrender...