Mary MacKillop on Mission: To Her Last Breath (editor: Sheila McCreanor) is a collection of correspondence documenting the final phase of the life of Saint Mary MacKillop, founder of the Sisters of St Joseph of the Sacred Heart. The book contains Mary MacKillop's letters, particularly those relating to the foundation of the Sisters of St Joseph in New Zealand (Aotearoa) and her final years in Australia. The correspondence reveals Mary's personal journey, beginning with great energy, but gradually showing a decline in health that led to her becoming an invalid after a stroke in Rotorua, New Zealand, on May 11, 1901. Despite the pressures, privations, and illness, her letters show that Mary's faith and trust in God remained strong until the end of her life (she died on August 8, 1909). This book serves as a primary source that provides deep insight into Mary MacKillop's character, spirituality, and tenacity in serving the poor, even in her frail physical condition and highlights how Mary, despite becoming an invalid, continued to lead her congregation's mission from her bedside until her last breath.