|summary=The story of Sister Catherine Mary and her nursing ministry in some of London's poorest areas.
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Katie Crisp had never intended to become a nun. Raised by non-religious parents, her family frowned upon organised religion and when Katie started secretly going to church, they strongly disapproved. When Katie ran to the aid of a stroke victim, she had a vision that changed her life. She saw herself dressed as a nun with a large silver cross hanging from her neck. She decided to follow her calling and join the community of St John the Divine, a group of Anglican nuns dedicated to nursing and midwifery. She thus shed her old identity and became known as Sister Catherine Mary.