My Sister St. Therese by Sr. Genevieve of the Holy Face (Celine Martin)
This may be my favorite book overall. I like it even better than the autobiography, because it provides many practical examples of everyday life by Therese's best friend and sister, Celine.
A little classic that is like a second Story of a Soul! Conversations, anecdotes of St. Therese, her teachings, hidden virtues and amusing remarks, etc -- recorded by her sister Celine in the convent. Shows the "Little Way" in practice in daily life.