An air-hostess is pregnant but she does not know the name of the father, a foreigner. When the baby is born, she gives it to her sister that has already two children. The child grows up as another member of the family. Although the adults keep the secret, the children know that he is different.
Armando, the only grandson of an old worker of Salinas de Aveiro, studies music in France and any news from him is scarce. The grandfather Abilio then decides to send him a letter announcing his death and Armando rushes to return.
