On the day her first book came out--a new translation of Dark Night of the Soul by Saint John of the Cross--Mirabai Starr's daughter, Jenny, was killed in a car accident. "My spiritual life began the day my daughter died," writes Mirabai. Even with decades of spiritual practice and a deep immersion in the greatest mystical texts, she found herself utterly unprepared for "my most powerful catalyst for transformation, my fiercest and most compassionate...