On October 23, 1994, Sisters Esther Paniagua Alonso and Caridad “Cari” Alvarez Martín were each shot in the head as they walked to Mass. Sister Esther was a nurse who worked with sick and disabled children and had painstakingly learned fluent Arabic. In the discernment meeting with Msgr. Teissier about whether to stay or go, she said to her sisters, “At this moment, for...