Del Wensley, wife of the most celebrated preacher in Harlan County, tries to mind her place. Until her husband's infidelity pushes an already strained marriage to a breaking point. Clinging to her last hope for self-respect, Del turns her back on the rigid life she's known. A coal train is rolling through the valley. With her eyes wide open to the unfamiliar, and to the freedom she craves, Del takes to the rails.

Rumbling across America, Del is soon drawn into a transient community among outcasts--and finds a special friend in Louisa Trout. A nomadic single mother, Louisa teaches Del the ways of the boxcars and promises to help her reach a migrant enclave where Del can learn the skills she'll need to survive. But as they move forward together under desperate circumstances, even the closest of bonds threatens to break.

With the Depression taking its toll, Del must gather her strength and faith. As she carries on toward one unknown after another, her life becomes a fulfilling, sometimes dangerous, and exhilarating adventure. But no matter the risks, it's a life that she alone controls.