"A Gratidão" is a novel by the famous Portuguese writer Camilo Castello-Branco. The main theme of the work is the high features of the human soul, moral principles and ethical standards. The book depicts the complex inner experiences of the characters, their moral doubts and reflections on life. The author gives the reader the opportunity to delve into the inner world of the heroes, to reveal their contradictions and internal conflicts. "A Gratidão" is a book that makes you think about the meaning of life and the value of relationships between people.