In poverty-ravaged Calcutta, Sister Teresa, a teacher at a boarding school for wealthy girls, feels God's call to leave everything behind to devote herself to those most in need. With determination, she defies church rules and plunges into the crowded streets, bringing comfort to the sick and marginalized, thus beginning her extraordinary mission of charity.

El cardenal Albino Luciani (Neri Marcor) ha viajado a Fátima donde se entrevista con la hermana Lucía (Imma Colomer), última superviviente de los tres pastorcillos que vieron a la Virgen y escucharon y guardaron los secretos que les confió. Lucía le revela al cardenal que pronto será elegido Papa, pero que su papado "será breve como lo es la vida de una semilla, ya que la semilla debe morir para que la planta pueda crecer y dar fruto".

The inspirational portrayal of Mother Teresa, a simple nun who became one of the most significant personalities of the 20th Century. Armed with a faith that could move mountains, Mother Teresa followed her calling to help the poor, the lepers, the dying and the abandoned children in the slums of Calcutta, challenging many authorities - including the church - along the way.