When Jem Coulter is caught in a miners' riot, he learns the worst: the Midas mine is no longer producing the gold the town relies on to stay alive. Will, the son of the mine's owner, tells Jem the only way to get the Midas working again is to blast deep into the ground. This means a nearby abandoned mine must be reclaimed for an air shaft. But Jem discovers that Chinese miners, including his friend Wu Shen, are working those old scavenger...