This biography investigates the life, spiritual motivations, and global impact of Mother Teresa, the founder of the Missionaries of Charity. Kathryn Spink, granted authorized access to the subject and her order, synthesizes primary source interviews, personal correspondence, and historical records to construct a comprehensive account of Mother Teresa's work in the slums of Calcutta. The narrative examines the intersection of her rigorous religious devotion and her practical efforts to alleviate suffering among the destitute and dying.

The text provides a dense, authorized examination of the subject's life, serving as a foundational resource for those seeking a detailed historical record of her work. Its scope and proximity to the subject suggest a sympathetic yet thorough treatment of her religious and humanitarian legacy.