The black capes is a nickname for the students of Coimbre who fight for their freedom. Pedro de Abrante is the leader, determined to avenge the death of his father, shot by Police lieutenant Don Diego de Albuque. He loves Rita whose father, a former farmer, helps him. Don Diego manages to capture Pedro, but he is rescued by the black capes. Don Diego perishes in a fire. Pedro and Rita are united by the old farmer.