The narrative unfolds through the eyes of a young girl named María, who, guided by a mysterious figure, witnesses pivotal moments in Spain's history. The story spans from the Visigothic era to the arrival of the railway, encapsulating significant events such as the reign of King Reccared I, the Battle of Las Navas de Tolosa, and the discovery of America. Each scene is crafted to evoke deep emotions, portraying themes of unity, conflict, and transformation.