Having abandoned his family due to religious differences, Dr Silveira moves to Coimbra, where he dedicates himself to his patients, and rejecting any attempts at reconciliation. But, when a terrible accident happens to his son, he must seek a resolution to the debate between faith and science.

The ill-conceived loves of Rosa, a modest seamstress, and Fernando a doctor, leaving in the shadow the fateful passion of António (a liberal) for the young woman.

Caleidoscope of documentary-like scenes and re-enacted episodes of a day in the life of a large port town – Lisbon, from the old district around Saint George's Castle down to the docks and the 'Sagres' on the Tagus river, to the new commercial districts.