A man has had a werewolf curse cast upon him. If he doesn't get rid of it, he turns into a killer werewolf when the moon is full.
At the end of the 19th century, young Rosita and her cousin are engaged to be married, shortly before he has to leave for Cuba.
Doña Emilia lives quietly in a village in Lugo, when she receives the news that her son has suffered an accident. So she travels to Madrid without warning.