Most of the letters are to her three sisters at the Lisieux Carmel (Sister Marie of the Sacred Heart {Marie}; Mother Agnes of Jesus {Pauline}; and Sister Genevieve of the Holy Face {Celine}). Several are to her uncle, Isidore Guerin. There are also letters to his wife, Celine Guerin; to their daughter Marie (Sister Marie of the Eucharist); and to Therese's prioress, Mother Marie de Gonzague. These letters, never before published in English, contain invaluable insight into Leonie's personality;her spirituality, prayer, and retreats; her daily life and the life of her Visitation community; her relationships with her three sisters in the Carmel; her reaction to Therese's beatification and canonization; and her response to World War I and World War II.