Mother Teresa, recipient of the Nobel Peace Prize, is considered one of the greatest humanitarians of modern times. Her selfless commitment changed hearts, lives and inspired millions throughout the world. This film tells her story through personal letters she wrote over the last 40 years of her life, revealing a troubled and vulnerable woman who grew to feel an isolation and an abandonment by God. It is told from the point of view of a Vatican priest charged with the task of investigating acts and events following her death. He recounts her life's work, her political oppression, her religious zeal and her unbreakable spirit.