In Guatemala, a small country not long emerged from three decades of civil war, women and girls are being murdered faster than anyone in authority can cope. Deborah Tomas Vineda, aged 16, was kidnapped, raped, and cut to pieces with a chainsaw, allegedly because she refused to become the girlfriend of a local gang member. Her sister Olga, just 11 years old, died alongside her. The raped and mutilated body of Andrea Contreras Bacaro, 17, was found wrapped in a plastic bag and thrown into a ditch, her throat cut, her face and hands slashed, with a gunshot wound to...