(Before ISIS, outside powers, including the Ottomans and other radical Islamic sects, had tried to destroy them 73 times, Murad writes in her book.) The local leader told the ISIS commander that they would never convert, believing his people would then be evacuated to a nearby town. “The small reddish-brown stains high up on the tiles were all that was left of some Yazidi girls who had come before me,” writes Murad.

An Illinois social worker seduced and kept a 24-year-old patient as a sex slave at a mental institution, according to a federal lawsuit.

Ben Hurt, 24, took legal action Thursday against one of his former social workers, 53-year-old Christy Lenhardt, who he said sexually abused him for three years at Elgin Mental Health Center, news station WBBM reported.

“What they did to my son was wrong.” Hurt, who was released from facility, also sued two other psychiatrists and the center’s director for allegedly ignoring the abuse.

Lenhardt was fired from the center in July but has not been charged with a crime.

This belief has given the Yazidi people a reputation among radical Muslims as devil worshipers. “You are an infidel, a sabiyya [sex slave] and you belong to the Islamic State now, so get used to it.” Then he spat in her face, took out a cigarette and extinguished it on her shoulder. Then he slapped her twice across the face and warned: “Never make another sound again.” In the dark, crowded room of a home where she and the other women were being held, Murad asked what awaited her; another woman who had been there longer told her to look for the stains on the bathroom wall where others had tried to kill themselves rather than be sold as slaves.

As a result, followers, who have no formal holy book of their own, have often been the target of genocidal impulses. “You can see the blood high on the walls where the cleaners don’t notice,” the woman told her.

The women, still in the schoolyard, could hear the shots just a short distance away. “Attacking Kocho and taking girls to use as sex slaves wasn’t a spontaneous decision,” she writes. Yazidis are infidels — that’s why we are doing this. Normally [my niece] and I would have been thrilled at the new makeup, which was a brand I recognized and could very rarely afford.

The older women and children were separated from the younger women. “ISIS planned it all: how they would come into our homes, what made a girl more or less valuable, which militants deserved a sabiyya as incentive and which should pay.” She paraphrases an Islamic State pamphlet which stated that “Sabiyya can be given as gifts and sold at the whim of the owner, for they are merely property.” Murad writes: “An owner can have sex with a prepubescent slave, it says, if she is ‘fit for intercourse.’ ” Sitting in a house surrounded by men with guns, the young woman contemplated killing herself. When an enormous man with calves “as thick as tree trunks” selected Murad as his slave, she screamed and tried to pull away. It’s to help you.” Hajji Salman told her to shower, put on a dress that came only to her knee — an immodest change from her normal wardrobe — and use hair-removal cream all over her body. I knew that if I didn’t wear any makeup, I would be punished, so I looked through the pile [left for me] . We would have stood in front of the bedroom mirror, painting our eyelids different colors, surrounding our eyes with thick lines of kohl, and covering our freckles with foundation.

The youngest of 11 children in a Yazidi family in northwest Iraq, she took photographs of all the brides in her tiny village, studying their makeup and hair.