Jillian knows that on Cedar Mountain, the past is never truly buried. Her family has spent their summers in Duck Creek Village for generations, keeping the old stories alive around the campfire. Carl, a tech-savvy newcomer, thinks he can solve any problem with a faster processor and a better GPS. But when a series of mysterious engine failures threatens the town’s most trusted ATV shop, Loose Wheels, Carl discovers that some problems require a different kind of “mechanical empathy.”

With the help of a legendary golden wrench rumored to have worked on the very first “Iron Horses” of the West, Carl and Jillian begin to hear the machines tell their secrets. As they track a modern saboteur through the deep lava beds and ancient forests, they are haunted by the legend of the Phantom Stagecoach—a red Concord coach that vanished in the blizzard of 1886. In a high-stakes race against a rival who wants to erase the mountain’s history, Jillian and Carl must decide: is the clatter of ghostly wheels a warning from the past, or a sign that the mountain is finally ready to reveal its most dangerous secret?