It is 1916 as Adobe Centori, owner of the Circle C Ranch in New Mexico, sits atop his horse next to ranch foreman Francisco Griego. While the mounted cowboys prepare for the spring roundup, Centori wonders about Mad Mady Blaylock. She is gone. Mad Mady silently slipped away from the Circle C during the night. A message from General Pershing arrives. He offers Centori a commission to join the pursuit of Pancho Villa into Mexico. While considering the offer, Centori learns about a treasure relating to the legendary Seven Cities of Cibola from pueblo leader Justo Calabaza. Sixteenth-century Spaniards believed that cities of gold were located in the New Mexico pueblos. The treasure tales were not proven. Yet Calabaza insists that one lost city of gold is buried within the Circle C boundaries. Centori shuns his skepticism and, with Griego and Calabaza, embarks on a scientific search for the Silver Medallion-the key to finding the gold. Carlene Cortina, a beautiful barnstorming pilot, wings Centori through the skies to help find the hidden entrance to the lost city. Intrigue develops as Santa Fe Sharon joins Carmencita, one of Mad Mady's doves, to locate the mine. Sharon wants more than gold-she wants revenge. The story ensues while Europe engages in a massive war. Adobe Centori's destiny reaches beyond Cibola as the Great War rages in France.