Seven years after the disastrous Battle of Alcácer Quibir, where King Sebastian and the nobleman Dom João disappeared, the latter's wife Dona Madalena de Vilhena finally gives up hope that he'll return and marries the knight Dom Manuel de Sousa Coutinho, with whom she has a daughter, who is afflicted by a fatal illness. Now only the tutor Telmo Pais retains the hope that the lost husband is alive, a premonition that may be confirmed after two decades, with the arrival of a mysterious pilgrim...

The Fidalgos da Casa Mourisca are ruined. Poor management and the pride of D. Luís have led the estate to this situation. However, Jorge, the eldest son, is not happy with this and decides to ask for help from a farmer who has prospered: Tomé da Póvoa. Tomé da Póvoa has a daughter who was educated outside the village and is now returning home. Jorge falls in love with her. But the proud and inflexible D. Luís, Jorge's father, does not agree with either Jorge's proposed economic recovery plan or his passion for a commoner.

The great fadista, Amelia Rodrigues, made her screen debut in Capas Negras, which took its name from the black capes worn by the students in the university city of Coimbra, where the film is set. The action begins in a tavern where a group of former students are reminiscing about their time at the university. One of the students, Jose Duarte then breaks into song, performing an impromptu fado in the local Coimbra style. The tavern owner's niece, the aptly named Maria Lisboa promptly retaliates with a fado of the Lisbon variety. The melodramatic plot then centers on the frustrated romance between these two characters, and the soundtrack is essentially a musical duel between these two different styles of Portugal's national song.

On the verge of being expelled from his home for not paying his debts, a government employee is mistaken for an inspector and decides to use that as an advantage.

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.

World peace is at stake if a spy-ring obtains the electronic device

To get away from the boredom of the city, Henrique de Souzelas visits his aunt Doroteia, in a picturesque village in the North, where he becomes attracted to his young, beautiful cousin Madalena.