The harrowing tale of one girl repeatedly raped, sent to a slave market and who then committed suicide is just the tip of a horrific iceberg. At least 150 Yazidi women and girls killed themselves after they were forced to become Islamic State sex slaves, according to a woman working with some of the survivors who managed to escape. In one of the most comprehensive accounts of the effects of Islamic State brutality, details emerged of the ordeals faced by hundreds of Yazidi women, very often after their male relatives were butchered by Islamic State members. Irifan Mahdi, who is...