It's 1882 in southern China. Li Jun, a feisty homeless girl disguised as a boy called Little Tiger, works in a fireworks factory and yearns to sail across the ocean to the mysterious Gold Mountain in faraway British Columbia to find her long-lost father and fulfill her promise to her dying mother. She joins thousands of Chinese men blasting a path for the new railway through the "impassable" Rocky Mountains. There she faces danger, deceit, and prejudice at every turn. Then, defying all the rules, she falls in love with James, the son of the railway tycoon. Should she reveal her true identity to him? Coming from such different worlds, could they make a life together?