Jacqueline Hansen Maggiore presents in this volume the biography of her lifelong friend Carol Piette, known throughout Chile and El Salvador as Sister Carla. Drawing from the memories of those who knew her and excerpts from her letters and diaries, "Vessel of Clay" chronicles Sister Carla's extraordinary life, highlighting her dedication to the poor of Latin America but also revealing her struggles with self-doubt and emotional frailty. "Vessel of Clay" will appeal to both lay and religious readers interested in peace and social justice, spiritual formation and development, women's issues, liberation theology, and mission service.