26 years ago, outlaw Billy the Kid's tombstone was stolen from Fort Sumner, New Mexico. Now it has mysteriously been returned. When teenage brothers Pancho and Dorado Dumez steal it themselves, they get more than they bargained for. Encased inside the tombstone is a map that leads to the Southwest's greatest treasure: The Lost Adams Diggings-a canyon comprised of solid gold. But the brothers aren't the only ones on the treasure's trail. So is bounty hunter Seven McCaw, and along with him comes a modern day incarnation of the Santa Fe Ring-a secretive organization that once ruled the West. Forced onto the open roads of New Mexico, the brothers must solve the mystery of Billy the Kid's death and find the lost canyon before the Ring does.