One demon is feared even by Satan. In Miami shelters, children know her by two names: Bloody Mary and La Llorona (the Crying Woman). She weeps blood or black tears from ghoulish empty sockets and feeds on children’s terror. When a child is killed accidentally in gang crossfire or is murdered, she croons with joy. “If you wake at night and see her,” a ten-year-old says softly, “her clothes be blowing back, even in a room where there is no wind. And you know she’s marked you for killing.”