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 diggings.  Even the arrival of James Carter, co-owner of the Midas, and the his son Chad can't convince the Chinese to give up their claim.

When Jem's father, farmer-turned-sheriff of Goldtown, is ordered to evict the Chinese from their mine or lose his job, Jem is caught in the middle. Then Will comes up with a solution.  If Jem goes along with it, Pa can keep his job and the Midas will get its air shaft.  What Jem doesn't realize is that Will's risky plan may lead to disaster deep in the heart of the old mine.

An exciting follow-up to Badge of Honor (book 1), Tunnel of Gold will entertain readers ages 8 to 14 with its fast-moving plot and colorful characters, and teach them historical details about life in the post-Gold Rush days of 1860s California.