Falacha is the captain of a fishing boat, who loses his men in a shipwreck. Among them was the husband of Aurélia, who holds Falacha responsible for the tragedy. Maria, Falacha's daughter, falls in love with Manuel, Aurélia's son, a situation that their mothers refuse to accept.

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.