It's the turn of the century, and dirigibles are the modern mode of travel. One of them is shadowing The Seahorse as it sails toward a fog-shrouded island off the coast of Peru, bringing young Richie Armstrong ever nearer the legendary Incan treasure—and the mysterious Golden Disk.

A strange chain of events has convinced Richie that the airship is being piloted by his archrival—the oily-haired Hans Von Hisle. Although Richie has in his possession the only known map to the island's location, would Hans need a map to spot the island from his lofty perch among the clouds?

It's a race against time. If Hans gets there first, Richie knows the Golden Disk and the precious possibility it holds for changing his past will be lost forever. But there's something else on the island—something that may change his future. And they're bloodthirsty.