In her impressive new novel, “Hurricane Season,” the Mexican writer Fernanda Melchor investigates the deep complicity between fairy tale and “femicide,” a term adopted by Mexican feminists to reckon with the systemic, accelerating and increasingly sadistic murders of women and girls in their country. Hundreds are killed each year, their bodies often mutilated in ways investigators struggle to explain. Some Mexican journalists speculate the women are victims of gangs that use corpse desecration to initiate members and reinforce loyalty.