A Corja reflects, concerning its theme, the inner conflicts that disturb the author and derive from his education and youthful experience. Themes such as social rupture, clandestine love relationships, the problem of bastards, the struggle against loves contradicted by social unevenness. Anticlericalism, inform stories carried out by characters such as the rural worker, the provincial nobleman, the urban bourgeoisie, and the "Brazilian" (Portuguese who enriches in Brazil by less lawful means), etc. Going through this novel's pages and those of almost all of Camilo Castelo Branco's work, these themes and characters allow him to recreate, in a nearly pictorial way, his time.
The work's story took place when apothecary Eusébio Macário and his family belonged to a higher social status and went to live in Porto, where his daughter marries a baron for mere reasons social status.
The author intends to criticize the bourgeois, the aristocrats and the clergy, personified here by the families of Eusébio Macário and Felícia and by Father Justino. Everything is allowed, and everything is accepted in the name of the "statute", as exemplified by the marriage of the aristocrat Felícia with a son of Eusébio Macário, José Macário. Even though it knew that she was the lover of Father Justino and to whom he continued to inform through from the pages of the newspaper "Periódico dos Pobres".