After Mother Teresa's death, her private letters revealed that she had spent nearly fifty years in spiritual darkness — feeling no presence of God, experiencing no comfort from prayer, and questioning whether God existed at all. The woman the world celebrated as a living saint had privately endured a half-century of spiritual anguish she shared with almost no one.

This episode traces Mother Teresa from her Albanian childhood through her calling to serve Calcutta's poorest, the founding of the Missionaries of Charity, and the private letters that revealed one of the most extraordinary spiritual crises in the history of the Catholic Church.

• Mother Teresa's early life in Skopje and the mystical experiences that sent her to Calcutta
• The founding of the Missionaries of Charity and her rise as a global icon of compassion
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