After surviving a shoot-out in Nogales and the scorching hot waters of a hidden subterranean abyss, Jack "Diamondback" McCall is on the hunt for an ancient Anasazi relic. On this quest, which takes him to a cave, deep in the Grand Canyon, he discovers the clue to finding an even greater prize, Aztec gold on a sunken island, lost for thousands of years. Jack heads for the Mexican coast along with Dakota Dan, his trusty sidekick, and Fawn, his clever...